    /**
     * @class Ext.button.Split
     * @extends Ext.button.Button
     * A split button that provides a built-in dropdown arrow that can fire an event separately from the default
     * click event of the button.  Typically this would be used to display a dropdown menu that provides additional
     * options to the primary button action, but any custom handler can provide the arrowclick implementation.
     * {@img Ext.button.Split/Ext.button.Split.png Ext.button.Split component}
     * Example usage:
     * <pre><code>
    // display a dropdown menu:
        Ext.create('Ext.button.Split', {
            renderTo: 'button-ct', // the container id
            text: 'Options',
            handler: optionsHandler, // handle a click on the button itself
            menu: new Ext.menu.Menu({
            items: [
                    // these items will render as dropdown menu items when the arrow is clicked:
                    {text: 'Item 1', handler: item1Handler},
                    {text: 'Item 2', handler: item2Handler}
            ]
            })
        });

    // Instead of showing a menu, you provide any type of custom
    // functionality you want when the dropdown arrow is clicked:
        Ext.create('Ext.button.Split', {
            renderTo: 'button-ct',
            text: 'Options',
            handler: optionsHandler,
            arrowHandler: myCustomHandler
        });
    </code></pre>
     * @cfg {Function} arrowHandler A function called when the arrow button is clicked (can be used instead of click event)
     * @cfg {String} arrowTooltip The title attribute of the arrow
     */
    Ext.define('Ext.button.Split', {

        /* Begin Definitions */

        alias: 'widget.splitbutton',

        extend: 'Ext.button.Button',
        alternateClassName: 'Ext.SplitButton',

        // private
        arrowCls      : 'split',
        split         : true,

        // private
        initComponent : function(){
            this.callParent();
            /**
             * @event arrowclick
             * Fires when this button's arrow is clicked
             * @param {MenuButton} this
             * @param {EventObject} e The click event
             */
            this.addEvents("arrowclick");
        },

         /**
         * Sets this button's arrow click handler.
         * @param {Function} handler The function to call when the arrow is clicked
         * @param {Object} scope (optional) Scope for the function passed above
         */
        setArrowHandler : function(handler, scope){
            this.arrowHandler = handler;
            this.scope = scope;
        },

        // private
        onClick : function(e, t) {
            var me = this;

            e.preventDefault();
            if (!me.disabled) {
                if (me.overMenuTrigger) {
                    if (me.menu && !me.menu.isVisible() && !me.ignoreNextClick) {
                        me.showMenu();
                    }
                    me.fireEvent("arrowclick", me, e);
                    if (me.arrowHandler) {
                        me.arrowHandler.call(me.scope || me, me, e);
                    }
                } else {
                    if (me.enableToggle) {
                        me.toggle();
                    }
                    me.fireEvent("click", me, e);
                    if (me.handler) {
                        me.handler.call(me.scope || me, me, e);
                    }
                    me.onBlur();
                }
            }
        }
    });