    /**
     * @class Ext.panel.Panel
     * @extends Ext.panel.AbstractPanel
     * <p>Panel is a container that has specific functionality and structural components that make
     * it the perfect building block for application-oriented user interfaces.</p>
     * <p>Panels are, by virtue of their inheritance from {@link Ext.container.Container}, capable
     * of being configured with a {@link Ext.container.Container#layout layout}, and containing child Components.</p>
     * <p>When either specifying child {@link Ext.Component#items items} of a Panel, or dynamically {@link Ext.container.Container#add adding} Components
     * to a Panel, remember to consider how you wish the Panel to arrange those child elements, and whether
     * those child elements need to be sized using one of Ext&#39;s built-in <code><b>{@link Ext.container.Container#layout layout}</b></code> schemes. By
     * default, Panels use the {@link Ext.layout.container.Auto Auto} scheme. This simply renders
     * child components, appending them one after the other inside the Container, and <b>does not apply any sizing</b>
     * at all.</p>
     * {@img Ext.panel.Panel/panel.png Panel components}
     * <p>A Panel may also contain {@link #bbar bottom} and {@link #tbar top} toolbars, along with separate
     * {@link #header}, {@link #footer} and {@link #body} sections (see {@link #frame} for additional
     * information).</p>
     * <p>Panel also provides built-in {@link #collapsible collapsible, expandable} and {@link #closable} behavior.
     * Panels can be easily dropped into any {@link Ext.container.Container Container} or layout, and the
     * layout and rendering pipeline is {@link Ext.container.Container#add completely managed by the framework}.</p>
     * <p><b>Note:</b> By default, the <code>{@link #closable close}</code> header tool <i>destroys</i> the Panel resulting in removal of the Panel
     * and the destruction of any descendant Components. This makes the Panel object, and all its descendants <b>unusable</b>. To enable the close
     * tool to simply <i>hide</i> a Panel for later re-use, configure the Panel with <b><code>{@link #closeAction closeAction: 'hide'}</code></b>.</p>
     * <p>Usually, Panels are used as constituents within an application, in which case, they would be used as child items of Containers,
     * and would themselves use Ext.Components as child {@link #items}. However to illustrate simply rendering a Panel into the document,
     * here&#39;s how to do it:<pre><code>
    Ext.create('Ext.panel.Panel', {
        title: 'Hello',
        width: 200,
        html: '&lt;p&gt;World!&lt;/p&gt;',
        renderTo: document.body
    });
    </code></pre></p>
     * <p>A more realistic scenario is a Panel created to house input fields which will not be rendered, but used as a constituent part of a Container:<pre><code>
    var filterPanel = Ext.create('Ext.panel.Panel', {
        bodyPadding: 5,  // Don&#39;t want content to crunch against the borders
        title: 'Filters',
        items: [{
            xtype: 'datefield',
            fieldLabel: 'Start date'
        }, {
            xtype: 'datefield',
            fieldLabel: 'End date'
        }]
    });
    </code></pre></p>
     * <p>Note that the Panel above is not configured to render into the document, nor is it configured with a size or position. In a real world scenario,
     * the Container into which the Panel is added will use a {@link #layout} to render, size and position its child Components.</p>
     * <p>Panels will often use specific {@link #layout}s to provide an application with shape and structure by containing and arranging child
     * Components: <pre><code>
    var resultsPanel = Ext.create('Ext.panel.Panel', {
        title: 'Results',
        width: 600,
        height: 400,
        renderTo: document.body,
        layout: {
            type: 'vbox',       // Arrange child items vertically
            align: 'stretch',    // Each takes up full width
            padding: 5
        },
        items: [{               // Results grid specified as a config object with an xtype of 'grid'
            xtype: 'grid',
            columns: [{header: 'Column One'}],            // One header just for show. There&#39;s no data,
            store: Ext.create('Ext.data.ArrayStore', {}), // A dummy empty data store
            flex: 1                                       // Use 1/3 of Container&#39;s height (hint to Box layout)
        }, {
            xtype: 'splitter'   // A splitter between the two child items
        }, {                    // Details Panel specified as a config object (no xtype defaults to 'panel').
            title: 'Details',
            bodyPadding: 5,
            items: [{
                fieldLabel: 'Data item',
                xtype: 'textfield'
            }], // An array of form fields
            flex: 2             // Use 2/3 of Container&#39;s height (hint to Box layout)
        }]
    });
    </code></pre>
     * The example illustrates one possible method of displaying search results. The Panel contains a grid with the resulting data arranged
     * in rows. Each selected row may be displayed in detail in the Panel below. The {@link Ext.layout.container.VBox vbox} layout is used
     * to arrange the two vertically. It is configured to stretch child items horizontally to full width. Child items may either be configured
     * with a numeric height, or with a <code>flex</code> value to distribute available space proportionately.</p>
     * <p>This Panel itself may be a child item of, for exaple, a {@link Ext.tab.Panel} which will size its child items to fit within its
     * content area.</p>
     * <p>Using these techniques, as long as the <b>layout</b> is chosen and configured correctly, an application may have any level of
     * nested containment, all dynamically sized according to configuration, the user&#39;s preference and available browser size.</p>
     * @constructor
     * @param {Object} config The config object
     * @xtype panel
     */
    Ext.define('Ext.panel.Panel', {
        extend: 'Ext.panel.AbstractPanel',
        requires: [
            'Ext.panel.Header',
            'Ext.fx.Anim',
            'Ext.util.KeyMap',
            'Ext.panel.DD',
            'Ext.XTemplate',
            'Ext.layout.component.Dock'
        ],
        alias: 'widget.panel',
        alternateClassName: 'Ext.Panel',

        /**
         * @cfg {String} collapsedCls
         * A CSS class to add to the panel&#39;s element after it has been collapsed (defaults to
         * <code>'collapsed'</code>).
         */
        collapsedCls: 'collapsed',

        /**
         * @cfg {Boolean} animCollapse
         * <code>true</code> to animate the transition when the panel is collapsed, <code>false</code> to skip the
         * animation (defaults to <code>true</code> if the {@link Ext.fx.Anim} class is available, otherwise <code>false</code>).
         * May also be specified as the animation duration in milliseconds.
         */
        animCollapse: Ext.enableFx,

        /**
         * @cfg {Number} minButtonWidth
         * Minimum width of all footer toolbar buttons in pixels (defaults to <tt>75</tt>). If set, this will
         * be used as the default value for the <tt>{@link Ext.button.Button#minWidth}</tt> config of
         * each Button added to the <b>footer toolbar</b> via the {@link #fbar} or {@link #buttons} configurations.
         * It will be ignored for buttons that have a minWidth configured some other way, e.g. in their own config
         * object or via the {@link Ext.container.Container#config-defaults defaults} of their parent container.
         */
        minButtonWidth: 75,

        /**
         * @cfg {Boolean} collapsed
         * <code>true</code> to render the panel collapsed, <code>false</code> to render it expanded (defaults to
         * <code>false</code>).
         */
        collapsed: false,

        /**
         * @cfg {Boolean} collapseFirst
         * <code>true</code> to make sure the collapse/expand toggle button always renders first (to the left of)
         * any other tools in the panel&#39;s title bar, <code>false</code> to render it last (defaults to <code>true</code>).
         */
        collapseFirst: true,

        /**
         * @cfg {Boolean} hideCollapseTool
         * <code>true</code> to hide the expand/collapse toggle button when <code>{@link #collapsible} == true</code>,
         * <code>false</code> to display it (defaults to <code>false</code>).
         */
        hideCollapseTool: false,

        /**
         * @cfg {Boolean} titleCollapse
         * <code>true</code> to allow expanding and collapsing the panel (when <code>{@link #collapsible} = true</code>)
         * by clicking anywhere in the header bar, <code>false</code>) to allow it only by clicking to tool button
         * (defaults to <code>false</code>)).
         */
        titleCollapse: false,

        /**
         * @cfg {String} collapseMode
         * <p><b>Important: this config is only effective for {@link #collapsible} Panels which are direct child items of a {@link Ext.layout.container.Border border layout}.</b></p>
         * <p>When <i>not</i> a direct child item of a {@link Ext.layout.container.Border border layout}, then the Panel&#39;s header remains visible, and the body is collapsed to zero dimensions.
         * If the Panel has no header, then a new header (orientated correctly depending on the {@link #collapseDirection}) will be inserted to show a the title and a re-expand tool.</p>
         * <p>When a child item of a {@link Ext.layout.container.Border border layout}, this config has two options:
         * <div class="mdetail-params"><ul>
         * <li><b><code>undefined/omitted</code></b><div class="sub-desc">When collapsed, a placeholder {@link Ext.panel.Header Header} is injected into the layout to represent the Panel
         * and to provide a UI with a Tool to allow the user to re-expand the Panel.</div></li>
         * <li><b><code>header</code></b> : <div class="sub-desc">The Panel collapses to leave its header visible as when not inside a {@link Ext.layout.container.Border border layout}.</div></li>
         * </ul></div></p>
         */

        /**
         * @cfg {Mixed} placeholder
         * <p><b>Important: This config is only effective for {@link #collapsible} Panels which are direct child items of a {@link Ext.layout.container.Border border layout}
         * when not using the <code>'header'</code> {@link #collapseMode}.</b></p>
         * <p><b>Optional.</b> A Component (or config object for a Component) to show in place of this Panel when this Panel is collapsed by a
         * {@link Ext.layout.container.Border border layout}. Defaults to a generated {@link Ext.panel.Header Header}
         * containing a {@link Ext.panel.Tool Tool} to re-expand the Panel.</p>
         */

        /**
         * @cfg {Boolean} floatable
         * <p><b>Important: This config is only effective for {@link #collapsible} Panels which are direct child items of a {@link Ext.layout.container.Border border layout}.</b></p>
         * <tt>true</tt> to allow clicking a collapsed Panel&#39;s {@link #placeholder} to display the Panel floated
         * above the layout, <tt>false</tt> to force the user to fully expand a collapsed region by
         * clicking the expand button to see it again (defaults to <tt>true</tt>).
         */
        floatable: true,

        /**
         * @cfg {Mixed} overlapHeader
         * True to overlap the header in a panel over the framing of the panel itself. This is needed when frame:true (and is done automatically for you). Otherwise it is undefined.
         * If you manually add rounded corners to a panel header which does not have frame:true, this will need to be set to true.
         */

        /**
         * @cfg {Boolean} collapsible
         * <p>True to make the panel collapsible and have an expand/collapse toggle Tool added into
         * the header tool button area. False to keep the panel sized either statically, or by an owning layout manager, with no toggle Tool (defaults to false).</p>
         * See {@link #collapseMode} and {@link #collapseDirection}
         */
        collapsible: false,

        /**
         * @cfg {Boolean} collapseDirection
         * <p>The direction to collapse the Panel when the toggle button is clicked.</p>
         * <p>Defaults to the {@link #headerPosition}</p>
         * <p><b>Important: This config is <u>ignored</u> for {@link #collapsible} Panels which are direct child items of a {@link Ext.layout.container.Border border layout}.</b></p>
         * <p>Specify as <code>'top'</code>, <code>'bottom'</code>, <code>'left'</code> or <code>'right'</code>.</p>
         */

        /**
         * @cfg {Boolean} closable
         * <p>True to display the 'close' tool button and allow the user to close the window, false to
         * hide the button and disallow closing the window (defaults to <code>false</code>).</p>
         * <p>By default, when close is requested by clicking the close button in the header, the {@link #close}
         * method will be called. This will <i>{@link Ext.Component#destroy destroy}</i> the Panel and its content
         * meaning that it may not be reused.</p>
         * <p>To make closing a Panel <i>hide</i> the Panel so that it may be reused, set
         * {@link #closeAction} to 'hide'.</p>
         */
        closable: false,

        /**
         * @cfg {String} closeAction
         * <p>The action to take when the close header tool is clicked:
         * <div class="mdetail-params"><ul>
         * <li><b><code>'{@link #destroy}'</code></b> : <b>Default</b><div class="sub-desc">
         * {@link #destroy remove} the window from the DOM and {@link Ext.Component#destroy destroy}
         * it and all descendant Components. The window will <b>not</b> be available to be
         * redisplayed via the {@link #show} method.
         * </div></li>
         * <li><b><code>'{@link #hide}'</code></b> : <div class="sub-desc">
         * {@link #hide} the window by setting visibility to hidden and applying negative offsets.
         * The window will be available to be redisplayed via the {@link #show} method.
         * </div></li>
         * </ul></div>
         * <p><b>Note:</b> This behavior has changed! setting *does* affect the {@link #close} method
         * which will invoke the approriate closeAction.
         */
        closeAction: 'destroy',

        /**
         * @cfg {Object/Array} dockedItems
         * A component or series of components to be added as docked items to this panel.
         * The docked items can be docked to either the top, right, left or bottom of a panel.
         * This is typically used for things like toolbars or tab bars:
         * <pre><code>
    var panel = new Ext.panel.Panel({
        dockedItems: [{
            xtype: 'toolbar',
            dock: 'top',
            items: [{
                text: 'Docked to the top'
            }]
        }]
    });</pre></code>
         */

        /**
          * @cfg {Boolean} preventHeader Prevent a Header from being created and shown. Defaults to false.
          */
        preventHeader: false,

         /**
          * @cfg {String} headerPosition Specify as <code>'top'</code>, <code>'bottom'</code>, <code>'left'</code> or <code>'right'</code>. Defaults to <code>'top'</code>.
          */
        headerPosition: 'top',

         /**
         * @cfg {Boolean} frame
         * True to apply a frame to the panel.
         */
        frame: false,

        /**
         * @cfg {Boolean} frameHeader
         * True to apply a frame to the panel panels header (if 'frame' is true).
         */
        frameHeader: true,

        /**
         * @cfg {Array} tools
         * An array of {@link Ext.panel.Tool} configs/instances to be added to the header tool area. The tools are stored as child
         * components of the header container. They can be accessed using {@link #down} and {#query}, as well as the other
         * component methods. The toggle tool is automatically created if {@link #collapsible} is set to true.
         * <p>Note that, apart from the toggle tool which is provided when a panel is collapsible, these
         * tools only provide the visual button. Any required functionality must be provided by adding
         * handlers that implement the necessary behavior.</p>
         * <p>Example usage:</p>
         * <pre><code>
    tools:[{
        type:'refresh',
        qtip: 'Refresh form Data',
        // hidden:true,
        handler: function(event, toolEl, panel){
            // refresh logic
        }
    },
    {
        type:'help',
        qtip: 'Get Help',
        handler: function(event, toolEl, panel){
            // show help here
        }
    }]
    </code></pre>
         */

        initComponent: function() {
            var me = this,
                cls;

            me.addEvents(
            /**
             * @event titlechange
             * Fires after the Panel title has been set or changed.
             * @param {Ext.panel.Panel} p the Panel which has been resized.
             * @param {String} newTitle The new title.
             * @param {String} oldTitle The previous panel title.
             */
                'titlechange',
            /**
             * @event iconchange
             * Fires after the Panel iconCls has been set or changed.
             * @param {Ext.panel.Panel} p the Panel which has been resized.
             * @param {String} newIconCls The new iconCls.
             * @param {String} oldIconCls The previous panel iconCls.
             */
                'iconchange'
            );

            if (me.unstyled) {
                me.setUI('plain');
            }

            if (me.frame) {
                me.setUI('default-framed');
            }

            me.callParent();

            me.collapseDirection = me.collapseDirection || me.headerPosition || Ext.Component.DIRECTION_TOP;

            // Backwards compatibility
            me.bridgeToolbars();
        },

        setBorder: function(border) {
            // var me     = this,
            //     method = (border === false || border === 0) ? 'addClsWithUI' : 'removeClsWithUI';
            //
            // me.callParent(arguments);
            //
            // if (me.collapsed) {
            //     me[method](me.collapsedCls + '-noborder');
            // }
            //
            // if (me.header) {
            //     me.header.setBorder(border);
            //     if (me.collapsed) {
            //         me.header[method](me.collapsedCls + '-noborder');
            //     }
            // }

            this.callParent(arguments);
        },

        beforeDestroy: function() {
            Ext.destroy(
                this.ghostPanel,
                this.dd
            );
            this.callParent();
        },

        initAria: function() {
            this.callParent();
            this.initHeaderAria();
        },

        initHeaderAria: function() {
            var me = this,
                el = me.el,
                header = me.header;
            if (el && header) {
                el.dom.setAttribute('aria-labelledby', header.titleCmp.id);
            }
        },

        getHeader: function() {
            return this.header;
        },

        /**
         * Set a title for the panel&#39;s header. See {@link Ext.panel.Header#title}.
         * @param {String} newTitle
         */
        setTitle: function(newTitle) {
            var me = this,
            oldTitle = this.title;

            me.title = newTitle;
            if (me.header) {
                me.header.setTitle(newTitle);
            } else {
                me.updateHeader();
            }

            if (me.reExpander) {
                me.reExpander.setTitle(newTitle);
            }
            me.fireEvent('titlechange', me, newTitle, oldTitle);
        },

        /**
         * Set the iconCls for the panel&#39;s header. See {@link Ext.panel.Header#iconCls}.
         * @param {String} newIconCls
         */
        setIconCls: function(newIconCls) {
            var me = this,
                oldIconCls = me.iconCls;

            me.iconCls = newIconCls;
            var header = me.header;
            if (header) {
                header.setIconCls(newIconCls);
            }
            me.fireEvent('iconchange', me, newIconCls, oldIconCls);
        },

        bridgeToolbars: function() {
            var me = this,
                fbar,
                fbarDefaults,
                minButtonWidth = me.minButtonWidth;

            function initToolbar (toolbar, pos) {
                if (Ext.isArray(toolbar)) {
                    toolbar = {
                        xtype: 'toolbar',
                        items: toolbar
                    };
                }
                else if (!toolbar.xtype) {
                    toolbar.xtype = 'toolbar';
                }
                toolbar.dock = pos;
                if (pos == 'left' || pos == 'right') {
                    toolbar.vertical = true;
                }
                return toolbar;
            }

            // Backwards compatibility

            /**
             * @cfg {Object/Array} tbar

    Convenience method. Short for 'Top Bar'.

        tbar: [
          { xtype: 'button', text: 'Button 1' }
        ]

    is equivalent to

        dockedItems: [{
            xtype: 'toolbar',
            dock: 'top',
            items: [
                { xtype: 'button', text: 'Button 1' }
            ]
        }]

             * @markdown
             */
            if (me.tbar) {
                me.addDocked(initToolbar(me.tbar, 'top'));
                me.tbar = null;
            }

            /**
             * @cfg {Object/Array} bbar

    Convenience method. Short for 'Bottom Bar'.

        bbar: [
          { xtype: 'button', text: 'Button 1' }
        ]

    is equivalent to

        dockedItems: [{
            xtype: 'toolbar',
            dock: 'bottom',
            items: [
                { xtype: 'button', text: 'Button 1' }
            ]
        }]

             * @markdown
             */
            if (me.bbar) {
                me.addDocked(initToolbar(me.bbar, 'bottom'));
                me.bbar = null;
            }

            /**
             * @cfg {Object/Array} buttons

    Convenience method used for adding buttons docked to the bottom right of the panel. This is a
    synonym for the {@link #fbar} config.

        buttons: [
          { text: 'Button 1' }
        ]

    is equivalent to

        dockedItems: [{
            xtype: 'toolbar',
            dock: 'bottom',
            defaults: {minWidth: {@link #minButtonWidth}},
            items: [
                { xtype: 'component', flex: 1 },
                { xtype: 'button', text: 'Button 1' }
            ]
        }]

    The {@link #minButtonWidth} is used as the default {@link Ext.button.Button#minWidth minWidth} for
    each of the buttons in the buttons toolbar.

             * @markdown
             */
            if (me.buttons) {
                me.fbar = me.buttons;
                me.buttons = null;
            }

            /**
             * @cfg {Object/Array} fbar

    Convenience method used for adding items to the bottom right of the panel. Short for Footer Bar.

        fbar: [
          { type: 'button', text: 'Button 1' }
        ]

    is equivalent to

        dockedItems: [{
            xtype: 'toolbar',
            dock: 'bottom',
            defaults: {minWidth: {@link #minButtonWidth}},
            items: [
                { xtype: 'component', flex: 1 },
                { xtype: 'button', text: 'Button 1' }
            ]
        }]

    The {@link #minButtonWidth} is used as the default {@link Ext.button.Button#minWidth minWidth} for
    each of the buttons in the fbar.

             * @markdown
             */
            if (me.fbar) {
                fbar = initToolbar(me.fbar, 'bottom');
                fbar.ui = 'footer';

                // Apply the minButtonWidth config to buttons in the toolbar
                if (minButtonWidth) {
                    fbarDefaults = fbar.defaults;
                    fbar.defaults = function(config) {
                        var defaults = fbarDefaults || {};
                        if ((!config.xtype || config.xtype === 'button' || (config.isComponent && config.isXType('button'))) &&
                                !('minWidth' in defaults)) {
                            defaults = Ext.apply({minWidth: minButtonWidth}, defaults);
                        }
                        return defaults;
                    };
                }

                fbar = me.addDocked(fbar)[0];
                fbar.insert(0, {
                    flex: 1,
                    xtype: 'component',
                    focusable: false
                });
                me.fbar = null;
            }

            /**
             * @cfg {Object/Array} lbar
             *
             * Convenience method. Short for 'Left Bar' (left-docked, vertical toolbar).
             *
             *    lbar: [
             *      { xtype: 'button', text: 'Button 1' }
             *    ]
             *
             * is equivalent to
             *
             *    dockedItems: [{
             *        xtype: 'toolbar',
             *        dock: 'left',
             *        items: [
             *            { xtype: 'button', text: 'Button 1' }
             *        ]
             *    }]
             *
             * @markdown
             */
            if (me.lbar) {
                me.addDocked(initToolbar(me.lbar, 'left'));
                me.lbar = null;
            }

            /**
             * @cfg {Object/Array} rbar
             *
             * Convenience method. Short for 'Right Bar' (right-docked, vertical toolbar).
             *
             *    rbar: [
             *      { xtype: 'button', text: 'Button 1' }
             *    ]
             *
             * is equivalent to
             *
             *    dockedItems: [{
             *        xtype: 'toolbar',
             *        dock: 'right',
             *        items: [
             *            { xtype: 'button', text: 'Button 1' }
             *        ]
             *    }]
             *
             * @markdown
             */
            if (me.rbar) {
                me.addDocked(initToolbar(me.rbar, 'right'));
                me.rbar = null;
            }
        },

        /**
         * @private
         * Tools are a Panel-specific capabilty.
         * Panel uses initTools. Subclasses may contribute tools by implementing addTools.
         */
        initTools: function() {
            var me = this;

            me.tools = me.tools || [];

            // Add a collapse tool unless configured to not show a collapse tool
            // or to not even show a header.
            if (me.collapsible && !(me.hideCollapseTool || me.header === false)) {
                me.collapseDirection = me.collapseDirection || me.headerPosition || 'top';
                me.collapseTool = me.expandTool = me.createComponent({
                    xtype: 'tool',
                    type: 'collapse-' + me.collapseDirection,
                    expandType: me.getOppositeDirection(me.collapseDirection),
                    handler: me.toggleCollapse,
                    scope: me
                });

                // Prepend collapse tool is configured to do so.
                if (me.collapseFirst) {
                    me.tools.unshift(me.collapseTool);
                }
            }

            // Add subclass-specific tools.
            me.addTools();

            // Make Panel closable.
            if (me.closable) {
                me.addClsWithUI('closable');
                me.addTool({
                    type: 'close',
                    handler: Ext.Function.bind(me.close, this, [])
                });
            }

            // Append collapse tool if needed.
            if (me.collapseTool && !me.collapseFirst) {
                me.tools.push(me.collapseTool);
            }
        },

        /**
         * @private
         * Template method to be implemented in subclasses to add their tools after the collapsible tool.
         */
        addTools: Ext.emptyFn,

        /**
         * <p>Closes the Panel. By default, this method, removes it from the DOM, {@link Ext.Component#destroy destroy}s
         * the Panel object and all its descendant Components. The {@link #beforeclose beforeclose}
         * event is fired before the close happens and will cancel the close action if it returns false.<p>
         * <p><b>Note:</b> This method is not affected by the {@link #closeAction} setting which
         * only affects the action triggered when clicking the {@link #closable 'close' tool in the header}.
         * To hide the Panel without destroying it, call {@link #hide}.</p>
         */
        close: function() {
            if (this.fireEvent('beforeclose', this) !== false) {
                this.doClose();
            }
        },

        // private
        doClose: function() {
            this.fireEvent('close', this);
            this[this.closeAction]();
        },

        onRender: function(ct, position) {
            var me = this,
                topContainer;

            // Add class-specific header tools.
            // Panel adds collapsible and closable.
            me.initTools();

            // Dock the header/title
            me.updateHeader();

            // If initially collapsed, collapsed flag must indicate true current state at this point.
            // Do collapse after the first time the Panel's structure has been laid out.
            if (me.collapsed) {
                me.collapsed = false;
                topContainer = me.findLayoutController();
                if (!me.hidden && topContainer) {
                    topContainer.on({
                        afterlayout: function() {
                            me.collapse(null, false, true);
                        },
                        single: true
                    });
                } else {
                    me.afterComponentLayout = function() {
                        delete me.afterComponentLayout;
                        Ext.getClass(me).prototype.afterComponentLayout.apply(me, arguments);
                        me.collapse(null, false, true);
                    };
                }
            }

            // Call to super after adding the header, to prevent an unnecessary re-layout
            me.callParent(arguments);
        },

        /**
         * Create, hide, or show the header component as appropriate based on the current config.
         * @private
         * @param {Boolean} force True to force the the header to be created
         */
        updateHeader: function(force) {
            var me = this,
                header = me.header,
                title = me.title,
                tools = me.tools;

            if (!me.preventHeader && (force || title || (tools && tools.length))) {
                if (!header) {
                    header = me.header = Ext.create('Ext.panel.Header', {
                        title       : title,
                        orientation : (me.headerPosition == 'left' || me.headerPosition == 'right') ? 'vertical' : 'horizontal',
                        dock        : me.headerPosition || 'top',
                        textCls     : me.headerTextCls,
                        iconCls     : me.iconCls,
                        baseCls     : me.baseCls + '-header',
                        tools       : tools,
                        ui          : me.ui,
                        indicateDrag: me.draggable,
                        border      : me.border,
                        frame       : me.frame && me.frameHeader,
                        ignoreParentFrame : me.frame || me.overlapHeader,
                        ignoreBorderManagement: me.frame || me.ignoreHeaderBorderManagement,
                        listeners   : me.collapsible && me.titleCollapse ? {
                            click: me.toggleCollapse,
                            scope: me
                        } : null
                    });
                    me.addDocked(header, 0);

                    // Reference the Header's tool array.
                    // Header injects named references.
                    me.tools = header.tools;
                }
                header.show();
                me.initHeaderAria();
            } else if (header) {
                header.hide();
            }
        },

        // inherit docs
        setUI: function(ui) {
            var me = this;

            me.callParent(arguments);

            if (me.header) {
                me.header.setUI(ui);
            }
        },

        // private
        getContentTarget: function() {
            return this.body;
        },

        getTargetEl: function() {
            return this.body || this.frameBody || this.el;
        },

        addTool: function(tool) {
            this.tools.push(tool);
            var header = this.header;
            if (header) {
                header.addTool(tool);
            }
            this.updateHeader();
        },

        getOppositeDirection: function(d) {
            var c = Ext.Component;
            switch (d) {
                case c.DIRECTION_TOP:
                    return c.DIRECTION_BOTTOM;
                case c.DIRECTION_RIGHT:
                    return c.DIRECTION_LEFT;
                case c.DIRECTION_BOTTOM:
                    return c.DIRECTION_TOP;
                case c.DIRECTION_LEFT:
                    return c.DIRECTION_RIGHT;
            }
        },

        /**
         * Collapses the panel body so that the body becomes hidden. Docked Components parallel to the
         * border towards which the collapse takes place will remain visible.  Fires the {@link #beforecollapse} event which will
         * cancel the collapse action if it returns false.
         * @param {Number} direction. The direction to collapse towards. Must be one of<ul>
         * <li>Ext.Component.DIRECTION_TOP</li>
         * <li>Ext.Component.DIRECTION_RIGHT</li>
         * <li>Ext.Component.DIRECTION_BOTTOM</li>
         * <li>Ext.Component.DIRECTION_LEFT</li></ul>
         * @param {Boolean} animate True to animate the transition, else false (defaults to the value of the
         * {@link #animCollapse} panel config)
         * @return {Ext.panel.Panel} this
         */
        collapse: function(direction, animate, /* private - passed if called at render time */ internal) {
            var me = this,
                c = Ext.Component,
                height = me.getHeight(),
                width = me.getWidth(),
                frameInfo,
                newSize = 0,
                dockedItems = me.dockedItems.items,
                dockedItemCount = dockedItems.length,
                i = 0,
                comp,
                pos,
                anim = {
                    from: {
                        height: height,
                        width: width
                    },
                    to: {
                        height: height,
                        width: width
                    },
                    listeners: {
                        afteranimate: me.afterCollapse,
                        scope: me
                    },
                    duration: Ext.Number.from(animate, Ext.fx.Anim.prototype.duration)
                },
                reExpander,
                reExpanderOrientation,
                reExpanderDock,
                getDimension,
                setDimension,
                collapseDimension;

            if (!direction) {
                direction = me.collapseDirection;
            }

            // If internal (Called because of initial collapsed state), then no animation, and no events.
            if (internal) {
                animate = false;
            } else if (me.collapsed || me.fireEvent('beforecollapse', me, direction, animate) === false) {
                return false;
            }

            reExpanderDock = direction;
            me.expandDirection = me.getOppositeDirection(direction);

            // Track docked items which we hide during collapsed state
            me.hiddenDocked = [];

            switch (direction) {
                case c.DIRECTION_TOP:
                case c.DIRECTION_BOTTOM:
                    me.expandedSize = me.getHeight();
                    reExpanderOrientation = 'horizontal';
                    collapseDimension = 'height';
                    getDimension = 'getHeight';
                    setDimension = 'setHeight';

                    // Collect the height of the visible header.
                    // Hide all docked items except the header.
                    // Hide *ALL* docked items if we're going to end up hiding the whole Panel anyway
                    for (; i < dockedItemCount; i++) {
                        comp = dockedItems[i];
                        if (comp.isVisible()) {
                            if (comp.isHeader && (!comp.dock || comp.dock == 'top' || comp.dock == 'bottom')) {
                                reExpander = comp;
                            } else {
                                me.hiddenDocked.push(comp);
                            }
                        }
                    }

                    if (direction == Ext.Component.DIRECTION_BOTTOM) {
                        pos = me.getPosition()[1] - Ext.fly(me.el.dom.offsetParent).getRegion().top;
                        anim.from.top = pos;
                    }
                    break;

                case c.DIRECTION_LEFT:
                case c.DIRECTION_RIGHT:
                    me.expandedSize = me.getWidth();
                    reExpanderOrientation = 'vertical';
                    collapseDimension = 'width';
                    getDimension = 'getWidth';
                    setDimension = 'setWidth';

                    // Collect the height of the visible header.
                    // Hide all docked items except the header.
                    // Hide *ALL* docked items if we're going to end up hiding the whole Panel anyway
                    for (; i < dockedItemCount; i++) {
                        comp = dockedItems[i];
                        if (comp.isVisible()) {
                            if (comp.isHeader && (comp.dock == 'left' || comp.dock == 'right')) {
                                reExpander = comp;
                            } else {
                                me.hiddenDocked.push(comp);
                            }
                        }
                    }

                    if (direction == Ext.Component.DIRECTION_RIGHT) {
                        pos = me.getPosition()[0] - Ext.fly(me.el.dom.offsetParent).getRegion().left;
                        anim.from.left = pos;
                    }
                    break;

                default:
                    throw('Panel collapse must be passed a valid Component collapse direction');
            }

            // No scrollbars when we shrink this Panel
            // And no laying out of any children... we're effectively *hiding* the body
            me.setAutoScroll(false);
            me.suspendLayout = true;
            me.body.setVisibilityMode(Ext.core.Element.DISPLAY);

            // Disable toggle tool during animated collapse
            if (animate && me.collapseTool) {
                me.collapseTool.disable();
            }

            // Add the collapsed class now, so that collapsed CSS rules are applied before measurements are taken.
            me.addClsWithUI(me.collapsedCls);
            // if (me.border === false) {
            //     me.addClsWithUI(me.collapsedCls + '-noborder');
            // }

            // We found a header: Measure it to find the collapse-to size.
            if (reExpander) {
                //we must add the collapsed cls to the header and then remove to get the proper height
                reExpander.addClsWithUI(me.collapsedCls);
                reExpander.addClsWithUI(me.collapsedCls + '-' + reExpander.dock);
                if (me.border && (!me.frame || (me.frame && Ext.supports.CSS3BorderRadius))) {
                    reExpander.addClsWithUI(me.collapsedCls + '-border-' + reExpander.dock);
                }

                frameInfo = reExpander.getFrameInfo();

                //get the size
                newSize = reExpander[getDimension]() + (frameInfo ? frameInfo[direction] : 0);

                //and remove
                reExpander.removeClsWithUI(me.collapsedCls);
                reExpander.removeClsWithUI(me.collapsedCls + '-' + reExpander.dock);
                if (me.border && (!me.frame || (me.frame && Ext.supports.CSS3BorderRadius))) {
                    reExpander.removeClsWithUI(me.collapsedCls + '-border-' + reExpander.dock);
                }
            }
            // No header: Render and insert a temporary one, and then measure it.
            else {
                reExpander = {
                    hideMode: 'offsets',
                    temporary: true,
                    title: me.title,
                    orientation: reExpanderOrientation,
                    dock: reExpanderDock,
                    textCls: me.headerTextCls,
                    iconCls: me.iconCls,
                    baseCls: me.baseCls + '-header',
                    ui: me.ui,
                    frame: me.frame && me.frameHeader,
                    ignoreParentFrame: me.frame || me.overlapHeader,
                    indicateDrag: me.draggable,
                    cls: me.baseCls + '-collapsed-placeholder ' + ' ' + Ext.baseCSSPrefix + 'docked ' + me.baseCls + '-' + me.ui + '-collapsed',
                    renderTo: me.el
                };
                if (!me.hideCollapseTool) {
                    reExpander[(reExpander.orientation == 'horizontal') ? 'tools' : 'items'] = [{
                        xtype: 'tool',
                        type: 'expand-' + me.expandDirection,
                        handler: me.toggleCollapse,
                        scope: me
                    }];
                }

                // Capture the size of the re-expander.
                // For vertical headers in IE6 and IE7, this will be sized by a CSS rule in _panel.scss
                reExpander = me.reExpander = Ext.create('Ext.panel.Header', reExpander);
                newSize = reExpander[getDimension]() + ((reExpander.frame) ? reExpander.frameSize[direction] : 0);
                reExpander.hide();

                // Insert the new docked item
                me.insertDocked(0, reExpander);
            }

            me.reExpander = reExpander;
            me.reExpander.addClsWithUI(me.collapsedCls);
            me.reExpander.addClsWithUI(me.collapsedCls + '-' + reExpander.dock);
            if (me.border && (!me.frame || (me.frame && Ext.supports.CSS3BorderRadius))) {
                me.reExpander.addClsWithUI(me.collapsedCls + '-border-' + me.reExpander.dock);
            }

            // If collapsing right or down, we'll be also animating the left or top.
            if (direction == Ext.Component.DIRECTION_RIGHT) {
                anim.to.left = pos + (width - newSize);
            } else if (direction == Ext.Component.DIRECTION_BOTTOM) {
                anim.to.top = pos + (height - newSize);
            }

            // Animate to the new size
            anim.to[collapseDimension] = newSize;

            // Remove any flex config before we attempt to collapse.
            me.savedFlex = me.flex;
            me.savedMinWidth = me.minWidth;
            me.savedMinHeight = me.minHeight;
            me.minWidth = 0;
            me.minHeight = 0;
            delete me.flex;

            if (animate) {
                me.animate(anim);
            } else {
                // EXTJSIV-1937 (would like to use setCalculateSize)
                // save width/height here, expand puts them back
                me.uncollapsedSize = { width: me.width, height: me.height };

                me.setSize(anim.to.width, anim.to.height);
                if (Ext.isDefined(anim.to.left) || Ext.isDefined(anim.to.top)) {
                    me.setPosition(anim.to.left, anim.to.top);
                }
                me.afterCollapse(false, internal);
            }
            return me;
        },

        afterCollapse: function(animated, internal) {
            var me = this,
                i = 0,
                l = me.hiddenDocked.length;

            me.minWidth = me.savedMinWidth;
            me.minHeight = me.savedMinHeight;

            me.body.hide();
            for (; i < l; i++) {
                me.hiddenDocked[i].hide();
            }
            if (me.reExpander) {
                me.reExpander.updateFrame();
                me.reExpander.show();
            }
            me.collapsed = true;

            if (!internal) {
                me.doComponentLayout();
            }

            if (me.resizer) {
                me.resizer.disable();
            }

            // If me Panel was configured with a collapse tool in its header, flip it's type
            if (me.collapseTool) {
                me.collapseTool.setType('expand-' + me.expandDirection);
            }
            if (!internal) {
                me.fireEvent('collapse', me);
            }

            // Re-enable the toggle tool after an animated collapse
            if (animated && me.collapseTool) {
                me.collapseTool.enable();
            }
        },

        /**
         * Expands the panel body so that it becomes visible.  Fires the {@link #beforeexpand} event which will
         * cancel the expand action if it returns false.
         * @param {Boolean} animate True to animate the transition, else false (defaults to the value of the
         * {@link #animCollapse} panel config)
         * @return {Ext.panel.Panel} this
         */
        expand: function(animate) {
            if (!this.collapsed || this.fireEvent('beforeexpand', this, animate) === false) {
                return false;
            }

            // EXTJSIV-1937 (would like to use setCalculateSize)
            if (this.uncollapsedSize) {
                Ext.Object.each(this.uncollapsedSize, function (name, value) {
                    if (Ext.isDefined(value)) {
                        this[name] = value;
                    } else {
                        delete this[name];
                    }
                }, this);
                delete this.uncollapsedSize;
            }

            var me = this,
                i = 0,
                l = me.hiddenDocked.length,
                direction = me.expandDirection,
                height = me.getHeight(),
                width = me.getWidth(),
                pos, anim, satisfyJSLint;

            // Disable toggle tool during animated expand
            if (animate && me.collapseTool) {
                me.collapseTool.disable();
            }

            // Show any docked items that we hid on collapse
            // And hide the injected reExpander Header
            for (; i < l; i++) {
                me.hiddenDocked[i].hidden = false;
                me.hiddenDocked[i].el.show();
            }
            if (me.reExpander) {
                if (me.reExpander.temporary) {
                    me.reExpander.hide();
                } else {
                    me.reExpander.removeClsWithUI(me.collapsedCls);
                    me.reExpander.removeClsWithUI(me.collapsedCls + '-' + me.reExpander.dock);
                    if (me.border && (!me.frame || (me.frame && Ext.supports.CSS3BorderRadius))) {
                        me.reExpander.removeClsWithUI(me.collapsedCls + '-border-' + me.reExpander.dock);
                    }
                    me.reExpander.updateFrame();
                }
            }

            // If me Panel was configured with a collapse tool in its header, flip it's type
            if (me.collapseTool) {
                me.collapseTool.setType('collapse-' + me.collapseDirection);
            }

            // Unset the flag before the potential call to calculateChildBox to calculate our newly flexed size
            me.collapsed = false;

            // Collapsed means body element was hidden
            me.body.show();

            // Remove any collapsed styling before any animation begins
            me.removeClsWithUI(me.collapsedCls);
            // if (me.border === false) {
            //     me.removeClsWithUI(me.collapsedCls + '-noborder');
            // }

            anim = {
                to: {
                },
                from: {
                    height: height,
                    width: width
                },
                listeners: {
                    afteranimate: me.afterExpand,
                    scope: me
                }
            };

            if ((direction == Ext.Component.DIRECTION_TOP) || (direction == Ext.Component.DIRECTION_BOTTOM)) {

                // If autoHeight, measure the height now we have shown the body element.
                if (me.autoHeight) {
                    me.setCalculatedSize(me.width, null);
                    anim.to.height = me.getHeight();

                    // Must size back down to collapsed for the animation.
                    me.setCalculatedSize(me.width, anim.from.height);
                }
                // If we were flexed, then we can't just restore to the saved size.
                // We must restore to the currently correct, flexed size, so we much ask the Box layout what that is.
                else if (me.savedFlex) {
                    me.flex = me.savedFlex;
                    anim.to.height = me.ownerCt.layout.calculateChildBox(me).height;
                    delete me.flex;
                }
                // Else, restore to saved height
                else {
                    anim.to.height = me.expandedSize;
                }

                // top needs animating upwards
                if (direction == Ext.Component.DIRECTION_TOP) {
                    pos = me.getPosition()[1] - Ext.fly(me.el.dom.offsetParent).getRegion().top;
                    anim.from.top = pos;
                    anim.to.top = pos - (anim.to.height - height);
                }
            } else if ((direction == Ext.Component.DIRECTION_LEFT) || (direction == Ext.Component.DIRECTION_RIGHT)) {

                // If autoWidth, measure the width now we have shown the body element.
                if (me.autoWidth) {
                    me.setCalculatedSize(null, me.height);
                    anim.to.width = me.getWidth();

                    // Must size back down to collapsed for the animation.
                    me.setCalculatedSize(anim.from.width, me.height);
                }
                // If we were flexed, then we can't just restore to the saved size.
                // We must restore to the currently correct, flexed size, so we much ask the Box layout what that is.
                else if (me.savedFlex) {
                    me.flex = me.savedFlex;
                    anim.to.width = me.ownerCt.layout.calculateChildBox(me).width;
                    delete me.flex;
                }
                // Else, restore to saved width
                else {
                    anim.to.width = me.expandedSize;
                }

                // left needs animating leftwards
                if (direction == Ext.Component.DIRECTION_LEFT) {
                    pos = me.getPosition()[0] - Ext.fly(me.el.dom.offsetParent).getRegion().left;
                    anim.from.left = pos;
                    anim.to.left = pos - (anim.to.width - width);
                }
            }

            if (animate) {
                me.animate(anim);
            } else {
                me.setSize(anim.to.width, anim.to.height);
                if (anim.to.x) {
                    me.setLeft(anim.to.x);
                }
                if (anim.to.y) {
                    me.setTop(anim.to.y);
                }
                me.afterExpand(false);
            }

            return me;
        },

        afterExpand: function(animated) {
            var me = this;
            me.setAutoScroll(me.initialConfig.autoScroll);

            // Restored to a calculated flex. Delete the set width and height properties so that flex works from now on.
            if (me.savedFlex) {
                me.flex = me.savedFlex;
                delete me.savedFlex;
                delete me.width;
                delete me.height;
            }

            // Reinstate layout out after Panel has re-expanded
            delete me.suspendLayout;
            if (animated && me.ownerCt) {
                me.ownerCt.doLayout();
            }

            if (me.resizer) {
                me.resizer.enable();
            }

            me.fireEvent('expand', me);

            // Re-enable the toggle tool after an animated expand
            if (animated && me.collapseTool) {
                me.collapseTool.enable();
            }
        },

        /**
         * Shortcut for performing an {@link #expand} or {@link #collapse} based on the current state of the panel.
         * @return {Ext.panel.Panel} this
         */
        toggleCollapse: function() {
            if (this.collapsed) {
                this.expand(this.animCollapse);
            } else {
                this.collapse(this.collapseDirection, this.animCollapse);
            }
            return this;
        },

        // private
        getKeyMap : function(){
            if(!this.keyMap){
                this.keyMap = Ext.create('Ext.util.KeyMap', this.el, this.keys);
            }
            return this.keyMap;
        },

        // private
        initDraggable : function(){
            /**
             * <p>If this Panel is configured {@link #draggable}, this property will contain
             * an instance of {@link Ext.dd.DragSource} which handles dragging the Panel.</p>
             * The developer must provide implementations of the abstract methods of {@link Ext.dd.DragSource}
             * in order to supply behaviour for each stage of the drag/drop process. See {@link #draggable}.
             * @type Ext.dd.DragSource.
             * @property dd
             */
            this.dd = Ext.create('Ext.panel.DD', this, Ext.isBoolean(this.draggable) ? null : this.draggable);
        },

        // private - helper function for ghost
        ghostTools : function() {
            var tools = [],
                origTools = this.initialConfig.tools;

            if (origTools) {
                Ext.each(origTools, function(tool) {
                    // Some tools can be full components, and copying them into the ghost
                    // actually removes them from the owning panel. You could also potentially
                    // end up with duplicate DOM ids as well. To avoid any issues we just make
                    // a simple bare-minimum clone of each tool for ghosting purposes.
                    tools.push({
                        type: tool.type
                    });
                });
            }
            else {
                tools = [{
                    type: 'placeholder'
                }];
            }
            return tools;
        },

        // private - used for dragging
        ghost: function(cls) {
            var me = this,
                ghostPanel = me.ghostPanel,
                box = me.getBox();

            if (!ghostPanel) {
                ghostPanel = Ext.create('Ext.panel.Panel', {
                    renderTo: document.body,
                    floating: {
                        shadow: false
                    },
                    frame: Ext.supports.CSS3BorderRadius ? me.frame : false,
                    title: me.title,
                    overlapHeader: me.overlapHeader,
                    headerPosition: me.headerPosition,
                    width: me.getWidth(),
                    height: me.getHeight(),
                    iconCls: me.iconCls,
                    baseCls: me.baseCls,
                    tools: me.ghostTools(),
                    cls: me.baseCls + '-ghost ' + (cls ||'')
                });
                me.ghostPanel = ghostPanel;
            }
            ghostPanel.floatParent = me.floatParent;
            if (me.floating) {
                ghostPanel.setZIndex(Ext.Number.from(me.el.getStyle('zIndex'), 0));
            } else {
                ghostPanel.toFront();
            }
            ghostPanel.el.show();
            ghostPanel.setPosition(box.x, box.y);
            ghostPanel.setSize(box.width, box.height);
            me.el.hide();
            if (me.floatingItems) {
                me.floatingItems.hide();
            }
            return ghostPanel;
        },

        // private
        unghost: function(show, matchPosition) {
            var me = this;
            if (!me.ghostPanel) {
                return;
            }
            if (show !== false) {
                me.el.show();
                if (matchPosition !== false) {
                    me.setPosition(me.ghostPanel.getPosition());
                }
                if (me.floatingItems) {
                    me.floatingItems.show();
                }
                Ext.defer(me.focus, 10, me);
            }
            me.ghostPanel.el.hide();
        },

        initResizable: function(resizable) {
            if (this.collapsed) {
                resizable.disabled = true;
            }
            this.callParent([resizable]);
        }
    });