    /**
     * @class Ext.data.NodeInterface
     * This class is meant to be used as a set of methods that are applied to the prototype of a
     * Record to decorate it with a Node API. This means that models used in conjunction with a tree
     * will have all of the tree related methods available on the model. In general this class will
     * not be used directly by the developer.
     */
    Ext.define('Ext.data.NodeInterface', {
        requires: ['Ext.data.Field'],

        statics: {
            /**
             * This method allows you to decorate a Record's prototype to implement the NodeInterface.
             * This adds a set of methods, new events, new properties and new fields on every Record
             * with the same Model as the passed Record.
             * @param {Ext.data.Record} record The Record you want to decorate the prototype of.
             * @static
             */
            decorate: function(record) {
                if (!record.isNode) {
                    // Apply the methods and fields to the prototype
                    // @TODO: clean this up to use proper class system stuff
                    var mgr = Ext.ModelManager,
                        modelName = record.modelName,
                        modelClass = mgr.getModel(modelName),
                        idName = modelClass.prototype.idProperty,
                        instances = Ext.Array.filter(mgr.all.getArray(), function(item) {
                            return item.modelName == modelName;
                        }),
                        iln = instances.length,
                        newFields = [],
                        i, instance, jln, j, newField;

                    // Start by adding the NodeInterface methods to the Model's prototype
                    modelClass.override(this.getPrototypeBody());
                    newFields = this.applyFields(modelClass, [
                        {name: idName,      type: 'string',  defaultValue: null},
                        {name: 'parentId',  type: 'string',  defaultValue: null},
                        {name: 'index',     type: 'int',     defaultValue: null},
                        {name: 'depth',     type: 'int',     defaultValue: 0},
                        {name: 'expanded',  type: 'bool',    defaultValue: false, persist: false},
                        {name: 'checked',   type: 'auto',    defaultValue: null},
                        {name: 'leaf',      type: 'bool',    defaultValue: false, persist: false},
                        {name: 'cls',       type: 'string',  defaultValue: null, persist: false},
                        {name: 'iconCls',   type: 'string',  defaultValue: null, persist: false},
                        {name: 'root',      type: 'boolean', defaultValue: false, persist: false},
                        {name: 'isLast',    type: 'boolean', defaultValue: false, persist: false},
                        {name: 'isFirst',   type: 'boolean', defaultValue: false, persist: false},
                        {name: 'allowDrop', type: 'boolean', defaultValue: true, persist: false},
                        {name: 'allowDrag', type: 'boolean', defaultValue: true, persist: false},
                        {name: 'loaded',    type: 'boolean', defaultValue: false, persist: false},
                        {name: 'loading',   type: 'boolean', defaultValue: false, persist: false},
                        {name: 'href',      type: 'string',  defaultValue: null, persist: false},
                        {name: 'hrefTarget',type: 'string',  defaultValue: null, persist: false},
                        {name: 'qtip',      type: 'string',  defaultValue: null, persist: false},
                        {name: 'qtitle',    type: 'string',  defaultValue: null, persist: false}
                    ]);

                    jln = newFields.length;
                    // Set default values to all instances already out there
                    for (i = 0; i < iln; i++) {
                        instance = instances[i];
                        for (j = 0; j < jln; j++) {
                            newField = newFields[j];
                            if (instance.get(newField.name) === undefined) {
                                instance.data[newField.name] = newField.defaultValue;
                            }
                        }
                    }
                }

                Ext.applyIf(record, {
                    firstChild: null,
                    lastChild: null,
                    parentNode: null,
                    previousSibling: null,
                    nextSibling: null,
                    childNodes: []
                });
                // Commit any fields so the record doesn't show as dirty initially
                record.commit(true);

                record.enableBubble([
                    /**
                     * @event append
                     * Fires when a new child node is appended
                     * @param {Node} this This node
                     * @param {Node} node The newly appended node
                     * @param {Number} index The index of the newly appended node
                     */
                    "append",

                    /**
                     * @event remove
                     * Fires when a child node is removed
                     * @param {Node} this This node
                     * @param {Node} node The removed node
                     */
                    "remove",

                    /**
                     * @event move
                     * Fires when this node is moved to a new location in the tree
                     * @param {Node} this This node
                     * @param {Node} oldParent The old parent of this node
                     * @param {Node} newParent The new parent of this node
                     * @param {Number} index The index it was moved to
                     */
                    "move",

                    /**
                     * @event insert
                     * Fires when a new child node is inserted.
                     * @param {Node} this This node
                     * @param {Node} node The child node inserted
                     * @param {Node} refNode The child node the node was inserted before
                     */
                    "insert",

                    /**
                     * @event beforeappend
                     * Fires before a new child is appended, return false to cancel the append.
                     * @param {Node} this This node
                     * @param {Node} node The child node to be appended
                     */
                    "beforeappend",

                    /**
                     * @event beforeremove
                     * Fires before a child is removed, return false to cancel the remove.
                     * @param {Node} this This node
                     * @param {Node} node The child node to be removed
                     */
                    "beforeremove",

                    /**
                     * @event beforemove
                     * Fires before this node is moved to a new location in the tree. Return false to cancel the move.
                     * @param {Node} this This node
                     * @param {Node} oldParent The parent of this node
                     * @param {Node} newParent The new parent this node is moving to
                     * @param {Number} index The index it is being moved to
                     */
                    "beforemove",

                     /**
                      * @event beforeinsert
                      * Fires before a new child is inserted, return false to cancel the insert.
                      * @param {Node} this This node
                      * @param {Node} node The child node to be inserted
                      * @param {Node} refNode The child node the node is being inserted before
                      */
                    "beforeinsert",

                    /**
                     * @event expand
                     * Fires when this node is expanded.
                     * @param {Node} this The expanding node
                     */
                    "expand",

                    /**
                     * @event collapse
                     * Fires when this node is collapsed.
                     * @param {Node} this The collapsing node
                     */
                    "collapse",

                    /**
                     * @event beforeexpand
                     * Fires before this node is expanded.
                     * @param {Node} this The expanding node
                     */
                    "beforeexpand",

                    /**
                     * @event beforecollapse
                     * Fires before this node is collapsed.
                     * @param {Node} this The collapsing node
                     */
                    "beforecollapse",

                    /**
                     * @event beforecollapse
                     * Fires before this node is collapsed.
                     * @param {Node} this The collapsing node
                     */
                    "sort"
                ]);

                return record;
            },

            applyFields: function(modelClass, addFields) {
                var modelPrototype = modelClass.prototype,
                    fields = modelPrototype.fields,
                    keys = fields.keys,
                    ln = addFields.length,
                    addField, i, name,
                    newFields = [];

                for (i = 0; i < ln; i++) {
                    addField = addFields[i];
                    if (!Ext.Array.contains(keys, addField.name)) {
                        addField = Ext.create('data.field', addField);

                        newFields.push(addField);
                        fields.add(addField);
                    }
                }

                return newFields;
            },

            getPrototypeBody: function() {
                return {
                    isNode: true,

                    /**
                     * Ensures that the passed object is an instance of a Record with the NodeInterface applied
                     * @return {Boolean}
                     */
                    createNode: function(node) {
                        if (Ext.isObject(node) && !node.isModel) {
                            node = Ext.ModelManager.create(node, this.modelName);
                        }
                        // Make sure the node implements the node interface
                        return Ext.data.NodeInterface.decorate(node);
                    },

                    /**
                     * Returns true if this node is a leaf
                     * @return {Boolean}
                     */
                    isLeaf : function() {
                        return this.get('leaf') === true;
                    },

                    /**
                     * Sets the first child of this node
                     * @private
                     * @param {Ext.data.NodeInterface} node
                     */
                    setFirstChild : function(node) {
                        this.firstChild = node;
                    },

                    /**
                     * Sets the last child of this node
                     * @private
                     * @param {Ext.data.NodeInterface} node
                     */
                    setLastChild : function(node) {
                        this.lastChild = node;
                    },

                    /**
                     * Updates general data of this node like isFirst, isLast, depth. This
                     * method is internally called after a node is moved. This shouldn't
                     * have to be called by the developer unless they are creating custom
                     * Tree plugins.
                     * @return {Boolean}
                     */
                    updateInfo: function(silent) {
                        var me = this,
                            isRoot = me.isRoot(),
                            parentNode = me.parentNode,
                            isFirst = (!parentNode ? true : parentNode.firstChild == me),
                            isLast = (!parentNode ? true : parentNode.lastChild == me),
                            depth = 0,
                            parent = me,
                            children = me.childNodes,
                            len = children.length,
                            i = 0;

                        while (parent.parentNode) {
                            ++depth;
                            parent = parent.parentNode;
                        }

                        me.beginEdit();
                        me.set({
                            isFirst: isFirst,
                            isLast: isLast,
                            depth: depth,
                            index: parentNode ? parentNode.indexOf(me) : 0,
                            parentId: parentNode ? parentNode.getId() : null
                        });
                        me.endEdit(silent);
                        if (silent) {
                            me.commit();
                        }

                        for (i = 0; i < len; i++) {
                            children[i].updateInfo(silent);
                        }
                    },

                    /**
                     * Returns true if this node is the last child of its parent
                     * @return {Boolean}
                     */
                    isLast : function() {
                       return this.get('isLast');
                    },

                    /**
                     * Returns true if this node is the first child of its parent
                     * @return {Boolean}
                     */
                    isFirst : function() {
                       return this.get('isFirst');
                    },

                    /**
                     * Returns true if this node has one or more child nodes, else false.
                     * @return {Boolean}
                     */
                    hasChildNodes : function() {
                        return !this.isLeaf() && this.childNodes.length > 0;
                    },

                    /**
                     * Returns true if this node has one or more child nodes, or if the <tt>expandable</tt>
                     * node attribute is explicitly specified as true (see {@link #attributes}), otherwise returns false.
                     * @return {Boolean}
                     */
                    isExpandable : function() {
                        return this.get('expandable') || this.hasChildNodes();
                    },

                    /**
                     * <p>Insert node(s) as the last child node of this node.</p>
                     * <p>If the node was previously a child node of another parent node, it will be removed from that node first.</p>
                     * @param {Node/Array} node The node or Array of nodes to append
                     * @return {Node} The appended node if single append, or null if an array was passed
                     */
                    appendChild : function(node, suppressEvents, suppressNodeUpdate) {
                        var me = this,
                            i, ln,
                            index,
                            oldParent,
                            ps;

                        // if passed an array or multiple args do them one by one
                        if (Ext.isArray(node)) {
                            for (i = 0, ln = node.length; i < ln; i++) {
                                me.appendChild(node[i]);
                            }
                        } else {
                            // Make sure it is a record
                            node = me.createNode(node);

                            if (suppressEvents !== true && me.fireEvent("beforeappend", me, node) === false) {
                                return false;
                            }

                            index = me.childNodes.length;
                            oldParent = node.parentNode;

                            // it's a move, make sure we move it cleanly
                            if (oldParent) {
                                if (suppressEvents !== true && node.fireEvent("beforemove", node, oldParent, me, index) === false) {
                                    return false;
                                }
                                oldParent.removeChild(node, null, false, true);
                            }

                            index = me.childNodes.length;
                            if (index === 0) {
                                me.setFirstChild(node);
                            }

                            me.childNodes.push(node);
                            node.parentNode = me;
                            node.nextSibling = null;

                            me.setLastChild(node);

                            ps = me.childNodes[index - 1];
                            if (ps) {
                                node.previousSibling = ps;
                                ps.nextSibling = node;
                                ps.updateInfo(suppressNodeUpdate);
                            } else {
                                node.previousSibling = null;
                            }

                            node.updateInfo(suppressNodeUpdate);

                            // As soon as we append a child to this node, we are loaded
                            if (!me.isLoaded()) {
                                me.set('loaded', true);
                            }
                            // If this node didnt have any childnodes before, update myself
                            else if (me.childNodes.length === 1) {
                                me.set('loaded', me.isLoaded());
                            }

                            if (suppressEvents !== true) {
                                me.fireEvent("append", me, node, index);

                                if (oldParent) {
                                    node.fireEvent("move", node, oldParent, me, index);
                                }
                            }

                            return node;
                        }
                    },

                    /**
                     * Returns the bubble target for this node
                     * @private
                     * @return {Object} The bubble target
                     */
                    getBubbleTarget: function() {
                        return this.parentNode;
                    },

                    /**
                     * Removes a child node from this node.
                     * @param {Node} node The node to remove
                     * @param {Boolean} destroy <tt>true</tt> to destroy the node upon removal. Defaults to <tt>false</tt>.
                     * @return {Node} The removed node
                     */
                    removeChild : function(node, destroy, suppressEvents, suppressNodeUpdate) {
                        var me = this,
                            index = me.indexOf(node);

                        if (index == -1 || (suppressEvents !== true && me.fireEvent("beforeremove", me, node) === false)) {
                            return false;
                        }

                        // remove it from childNodes collection
                        me.childNodes.splice(index, 1);

                        // update child refs
                        if (me.firstChild == node) {
                            me.setFirstChild(node.nextSibling);
                        }
                        if (me.lastChild == node) {
                            me.setLastChild(node.previousSibling);
                        }

                        // update siblings
                        if (node.previousSibling) {
                            node.previousSibling.nextSibling = node.nextSibling;
                            node.previousSibling.updateInfo(suppressNodeUpdate);
                        }
                        if (node.nextSibling) {
                            node.nextSibling.previousSibling = node.previousSibling;
                            node.nextSibling.updateInfo(suppressNodeUpdate);
                        }

                        if (suppressEvents !== true) {
                            me.fireEvent("remove", me, node);
                        }

                        // If this node suddenly doesnt have childnodes anymore, update myself
                        if (!me.childNodes.length) {
                            me.set('loaded', me.isLoaded());
                        }

                        if (destroy) {
                            node.destroy(true);
                        } else {
                            node.clear();
                        }

                        return node;
                    },

                    /**
                     * Creates a copy (clone) of this Node.
                     * @param {String} id (optional) A new id, defaults to this Node's id. See <code>{@link #id}</code>.
                     * @param {Boolean} deep (optional) <p>If passed as <code>true</code>, all child Nodes are recursively copied into the new Node.</p>
                     * <p>If omitted or false, the copy will have no child Nodes.</p>
                     * @return {Node} A copy of this Node.
                     */
                    copy: function(newId, deep) {
                        var me = this,
                            result = me.callOverridden(arguments),
                            len = me.childNodes ? me.childNodes.length : 0,
                            i;

                        // Move child nodes across to the copy if required
                        if (deep) {
                            for (i = 0; i < len; i++) {
                                result.appendChild(me.childNodes[i].copy(true));
                            }
                        }
                        return result;
                    },

                    /**
                     * Clear the node.
                     * @private
                     * @param {Boolean} destroy True to destroy the node.
                     */
                    clear : function(destroy) {
                        var me = this;

                        // clear any references from the node
                        me.parentNode = me.previousSibling = me.nextSibling = null;
                        if (destroy) {
                            me.firstChild = me.lastChild = null;
                        }
                    },

                    /**
                     * Destroys the node.
                     */
                    destroy : function(silent) {
                        /*
                         * Silent is to be used in a number of cases
                         * 1) When setRoot is called.
                         * 2) When destroy on the tree is called
                         * 3) For destroying child nodes on a node
                         */
                        var me = this;

                        if (silent === true) {
                            me.clear(true);
                            Ext.each(me.childNodes, function(n) {
                                n.destroy(true);
                            });
                            me.childNodes = null;
                        } else {
                            me.remove(true);
                        }

                        me.callOverridden();
                    },

                    /**
                     * Inserts the first node before the second node in this nodes childNodes collection.
                     * @param {Node} node The node to insert
                     * @param {Node} refNode The node to insert before (if null the node is appended)
                     * @return {Node} The inserted node
                     */
                    insertBefore : function(node, refNode, suppressEvents) {
                        var me = this,
                            index     = me.indexOf(refNode),
                            oldParent = node.parentNode,
                            refIndex  = index,
                            ps;

                        if (!refNode) { // like standard Dom, refNode can be null for append
                            return me.appendChild(node);
                        }

                        // nothing to do
                        if (node == refNode) {
                            return false;
                        }

                        // Make sure it is a record with the NodeInterface
                        node = me.createNode(node);

                        if (suppressEvents !== true && me.fireEvent("beforeinsert", me, node, refNode) === false) {
                            return false;
                        }

                        // when moving internally, indexes will change after remove
                        if (oldParent == me && me.indexOf(node) < index) {
                            refIndex--;
                        }

                        // it's a move, make sure we move it cleanly
                        if (oldParent) {
                            if (suppressEvents !== true && node.fireEvent("beforemove", node, oldParent, me, index, refNode) === false) {
                                return false;
                            }
                            oldParent.removeChild(node);
                        }

                        if (refIndex === 0) {
                            me.setFirstChild(node);
                        }

                        me.childNodes.splice(refIndex, 0, node);
                        node.parentNode = me;

                        node.nextSibling = refNode;
                        refNode.previousSibling = node;

                        ps = me.childNodes[refIndex - 1];
                        if (ps) {
                            node.previousSibling = ps;
                            ps.nextSibling = node;
                            ps.updateInfo();
                        } else {
                            node.previousSibling = null;
                        }

                        node.updateInfo();

                        if (!me.isLoaded()) {
                            me.set('loaded', true);
                        }
                        // If this node didnt have any childnodes before, update myself
                        else if (me.childNodes.length === 1) {
                            me.set('loaded', me.isLoaded());
                        }

                        if (suppressEvents !== true) {
                            me.fireEvent("insert", me, node, refNode);

                            if (oldParent) {
                                node.fireEvent("move", node, oldParent, me, refIndex, refNode);
                            }
                        }

                        return node;
                    },

                    /**
                     * Insert a node into this node
                     * @param {Number} index The zero-based index to insert the node at
                     * @param {Ext.data.Model} node The node to insert
                     * @return {Ext.data.Record} The record you just inserted
                     */
                    insertChild: function(index, node) {
                        var sibling = this.childNodes[index];
                        if (sibling) {
                            return this.insertBefore(node, sibling);
                        }
                        else {
                            return this.appendChild(node);
                        }
                    },

                    /**
                     * Removes this node from its parent
                     * @param {Boolean} destroy <tt>true</tt> to destroy the node upon removal. Defaults to <tt>false</tt>.
                     * @return {Node} this
                     */
                    remove : function(destroy, suppressEvents) {
                        var parentNode = this.parentNode;

                        if (parentNode) {
                            parentNode.removeChild(this, destroy, suppressEvents, true);
                        }
                        return this;
                    },

                    /**
                     * Removes all child nodes from this node.
                     * @param {Boolean} destroy <tt>true</tt> to destroy the node upon removal. Defaults to <tt>false</tt>.
                     * @return {Node} this
                     */
                    removeAll : function(destroy, suppressEvents) {
                        var cn = this.childNodes,
                            n;

                        while ((n = cn[0])) {
                            this.removeChild(n, destroy, suppressEvents);
                        }
                        return this;
                    },

                    /**
                     * Returns the child node at the specified index.
                     * @param {Number} index
                     * @return {Node}
                     */
                    getChildAt : function(index) {
                        return this.childNodes[index];
                    },

                    /**
                     * Replaces one child node in this node with another.
                     * @param {Node} newChild The replacement node
                     * @param {Node} oldChild The node to replace
                     * @return {Node} The replaced node
                     */
                    replaceChild : function(newChild, oldChild, suppressEvents) {
                        var s = oldChild ? oldChild.nextSibling : null;

                        this.removeChild(oldChild, suppressEvents);
                        this.insertBefore(newChild, s, suppressEvents);
                        return oldChild;
                    },

                    /**
                     * Returns the index of a child node
                     * @param {Node} node
                     * @return {Number} The index of the node or -1 if it was not found
                     */
                    indexOf : function(child) {
                        return Ext.Array.indexOf(this.childNodes, child);
                    },

                    /**
                     * Returns depth of this node (the root node has a depth of 0)
                     * @return {Number}
                     */
                    getDepth : function() {
                        return this.get('depth');
                    },

                    /**
                     * Bubbles up the tree from this node, calling the specified function with each node. The arguments to the function
                     * will be the args provided or the current node. If the function returns false at any point,
                     * the bubble is stopped.
                     * @param {Function} fn The function to call
                     * @param {Object} scope (optional) The scope (<code>this</code> reference) in which the function is executed. Defaults to the current Node.
                     * @param {Array} args (optional) The args to call the function with (default to passing the current Node)
                     */
                    bubble : function(fn, scope, args) {
                        var p = this;
                        while (p) {
                            if (fn.apply(scope || p, args || [p]) === false) {
                                break;
                            }
                            p = p.parentNode;
                        }
                    },

                    //<deprecated since=0.99>
                    cascade: function() {
                        if (Ext.isDefined(Ext.global.console)) {
                            Ext.global.console.warn('Ext.data.Node: cascade has been deprecated. Please use cascadeBy instead.');
                        }
                        return this.cascadeBy.apply(this, arguments);
                    },
                    //</deprecated>

                    /**
                     * Cascades down the tree from this node, calling the specified function with each node. The arguments to the function
                     * will be the args provided or the current node. If the function returns false at any point,
                     * the cascade is stopped on that branch.
                     * @param {Function} fn The function to call
                     * @param {Object} scope (optional) The scope (<code>this</code> reference) in which the function is executed. Defaults to the current Node.
                     * @param {Array} args (optional) The args to call the function with (default to passing the current Node)
                     */
                    cascadeBy : function(fn, scope, args) {
                        if (fn.apply(scope || this, args || [this]) !== false) {
                            var childNodes = this.childNodes,
                                length     = childNodes.length,
                                i;

                            for (i = 0; i < length; i++) {
                                childNodes[i].cascadeBy(fn, scope, args);
                            }
                        }
                    },

                    /**
                     * Interates the child nodes of this node, calling the specified function with each node. The arguments to the function
                     * will be the args provided or the current node. If the function returns false at any point,
                     * the iteration stops.
                     * @param {Function} fn The function to call
                     * @param {Object} scope (optional) The scope (<code>this</code> reference) in which the function is executed. Defaults to the current Node in the iteration.
                     * @param {Array} args (optional) The args to call the function with (default to passing the current Node)
                     */
                    eachChild : function(fn, scope, args) {
                        var childNodes = this.childNodes,
                            length     = childNodes.length,
                            i;

                        for (i = 0; i < length; i++) {
                            if (fn.apply(scope || this, args || [childNodes[i]]) === false) {
                                break;
                            }
                        }
                    },

                    /**
                     * Finds the first child that has the attribute with the specified value.
                     * @param {String} attribute The attribute name
                     * @param {Mixed} value The value to search for
                     * @param {Boolean} deep (Optional) True to search through nodes deeper than the immediate children
                     * @return {Node} The found child or null if none was found
                     */
                    findChild : function(attribute, value, deep) {
                        return this.findChildBy(function() {
                            return this.get(attribute) == value;
                        }, null, deep);
                    },

                    /**
                     * Finds the first child by a custom function. The child matches if the function passed returns <code>true</code>.
                     * @param {Function} fn A function which must return <code>true</code> if the passed Node is the required Node.
                     * @param {Object} scope (optional) The scope (<code>this</code> reference) in which the function is executed. Defaults to the Node being tested.
                     * @param {Boolean} deep (Optional) True to search through nodes deeper than the immediate children
                     * @return {Node} The found child or null if none was found
                     */
                    findChildBy : function(fn, scope, deep) {
                        var cs = this.childNodes,
                            len = cs.length,
                            i = 0, n, res;

                        for (; i < len; i++) {
                            n = cs[i];
                            if (fn.call(scope || n, n) === true) {
                                return n;
                            }
                            else if (deep) {
                                res = n.findChildBy(fn, scope, deep);
                                if (res !== null) {
                                    return res;
                                }
                            }
                        }

                        return null;
                    },

                    /**
                     * Returns true if this node is an ancestor (at any point) of the passed node.
                     * @param {Node} node
                     * @return {Boolean}
                     */
                    contains : function(node) {
                        return node.isAncestor(this);
                    },

                    /**
                     * Returns true if the passed node is an ancestor (at any point) of this node.
                     * @param {Node} node
                     * @return {Boolean}
                     */
                    isAncestor : function(node) {
                        var p = this.parentNode;
                        while (p) {
                            if (p == node) {
                                return true;
                            }
                            p = p.parentNode;
                        }
                        return false;
                    },

                    /**
                     * Sorts this nodes children using the supplied sort function.
                     * @param {Function} fn A function which, when passed two Nodes, returns -1, 0 or 1 depending upon required sort order.
                     * @param {Boolean} recursive Whether or not to apply this sort recursively
                     * @param {Boolean} suppressEvent Set to true to not fire a sort event.
                     */
                    sort : function(sortFn, recursive, suppressEvent) {
                        var cs  = this.childNodes,
                            ln = cs.length,
                            i, n;

                        if (ln > 0) {
                            Ext.Array.sort(cs, sortFn);
                            for (i = 0; i < ln; i++) {
                                n = cs[i];
                                n.previousSibling = cs[i-1];
                                n.nextSibling = cs[i+1];

                                if (i === 0) {
                                    this.setFirstChild(n);
                                    n.updateInfo();
                                }
                                if (i == ln - 1) {
                                    this.setLastChild(n);
                                    n.updateInfo();
                                }
                                if (recursive && !n.isLeaf()) {
                                    n.sort(sortFn, true, true);
                                }
                            }

                            if (suppressEvent !== true) {
                                this.fireEvent('sort', this, cs);
                            }
                        }
                    },

                    /**
                     * Returns true if this node is expaned
                     * @return {Boolean}
                     */
                    isExpanded: function() {
                        return this.get('expanded');
                    },

                    /**
                     * Returns true if this node is loaded
                     * @return {Boolean}
                     */
                    isLoaded: function() {
                        return this.get('loaded');
                    },

                    /**
                     * Returns true if this node is loading
                     * @return {Boolean}
                     */
                    isLoading: function() {
                        return this.get('loading');
                    },

                    /**
                     * Returns true if this node is the root node
                     * @return {Boolean}
                     */
                    isRoot: function() {
                        return !this.parentNode;
                    },

                    /**
                     * Returns true if this node is visible
                     * @return {Boolean}
                     */
                    isVisible: function() {
                        var parent = this.parentNode;
                        while (parent) {
                            if (!parent.isExpanded()) {
                                return false;
                            }
                            parent = parent.parentNode;
                        }
                        return true;
                    },

                    /**
                     * Expand this node.
                     * @param {Function} recursive (Optional) True to recursively expand all the children
                     * @param {Function} callback (Optional) The function to execute once the expand completes
                     * @param {Object} scope (Optional) The scope to run the callback in
                     */
                    expand: function(recursive, callback, scope) {
                        var me = this;

                        // all paths must call the callback (eventually) or things like
                        // selectPath fail

                        // First we start by checking if this node is a parent
                        if (!me.isLeaf()) {
                            // Now we check if this record is already expanding or expanded
                            if (!me.isLoading() && !me.isExpanded()) {
                                // The TreeStore actually listens for the beforeexpand method and checks
                                // whether we have to asynchronously load the children from the server
                                // first. Thats why we pass a callback function to the event that the
                                // store can call once it has loaded and parsed all the children.
                                me.fireEvent('beforeexpand', me, function(records) {
                                    me.set('expanded', true);
                                    me.fireEvent('expand', me, me.childNodes, false);

                                    // Call the expandChildren method if recursive was set to true
                                    if (recursive) {
                                        me.expandChildren(true, callback, scope);
                                    }
                                    else {
                                        Ext.callback(callback, scope || me, [me.childNodes]);
                                    }
                                }, me);
                            }
                            // If it is is already expanded but we want to recursively expand then call expandChildren
                            else if (recursive) {
                                me.expandChildren(true, callback, scope);
                            }
                            else {
                                Ext.callback(callback, scope || me, [me.childNodes]);
                            }

                            // TODO - if the node isLoading, we probably need to defer the
                            // callback until it is loaded (e.g., selectPath would need us
                            // to not make the callback until the childNodes exist).
                        }
                        // If it's not then we fire the callback right away
                        else {
                            Ext.callback(callback, scope || me); // leaf = no childNodes
                        }
                    },

                    /**
                     * Expand all the children of this node.
                     * @param {Function} recursive (Optional) True to recursively expand all the children
                     * @param {Function} callback (Optional) The function to execute once all the children are expanded
                     * @param {Object} scope (Optional) The scope to run the callback in
                     */
                    expandChildren: function(recursive, callback, scope) {
                        var me = this,
                            i = 0,
                            nodes = me.childNodes,
                            ln = nodes.length,
                            node,
                            expanding = 0;

                        for (; i < ln; ++i) {
                            node = nodes[i];
                            if (!node.isLeaf() && !node.isExpanded()) {
                                expanding++;
                                nodes[i].expand(recursive, function () {
                                    expanding--;
                                    if (callback && !expanding) {
                                        Ext.callback(callback, scope || me, me.childNodes);
                                    }
                                });
                            }
                        }

                        if (!expanding && callback) {
                            Ext.callback(callback, scope || me, me.childNodes);
                        }
                    },

                    /**
                     * Collapse this node.
                     * @param {Function} recursive (Optional) True to recursively collapse all the children
                     * @param {Function} callback (Optional) The function to execute once the collapse completes
                     * @param {Object} scope (Optional) The scope to run the callback in
                     */
                    collapse: function(recursive, callback, scope) {
                        var me = this;

                        // First we start by checking if this node is a parent
                        if (!me.isLeaf()) {
                            // Now we check if this record is already collapsing or collapsed
                            if (!me.collapsing && me.isExpanded()) {
                                me.fireEvent('beforecollapse', me, function(records) {
                                    me.set('expanded', false);
                                    me.fireEvent('collapse', me, me.childNodes, false);

                                    // Call the collapseChildren method if recursive was set to true
                                    if (recursive) {
                                        me.collapseChildren(true, callback, scope);
                                    }
                                    else {
                                        Ext.callback(callback, scope || me, [me.childNodes]);
                                    }
                                }, me);
                            }
                            // If it is is already collapsed but we want to recursively collapse then call collapseChildren
                            else if (recursive) {
                                me.collapseChildren(true, callback, scope);
                            }
                        }
                        // If it's not then we fire the callback right away
                        else {
                            Ext.callback(callback, scope || me, me.childNodes);
                        }
                    },

                    /**
                     * Collapse all the children of this node.
                     * @param {Function} recursive (Optional) True to recursively collapse all the children
                     * @param {Function} callback (Optional) The function to execute once all the children are collapsed
                     * @param {Object} scope (Optional) The scope to run the callback in
                     */
                    collapseChildren: function(recursive, callback, scope) {
                        var me = this,
                            i = 0,
                            nodes = me.childNodes,
                            ln = nodes.length,
                            node,
                            collapsing = 0;

                        for (; i < ln; ++i) {
                            node = nodes[i];
                            if (!node.isLeaf() && node.isExpanded()) {
                                collapsing++;
                                nodes[i].collapse(recursive, function () {
                                    collapsing--;
                                    if (callback && !collapsing) {
                                        Ext.callback(callback, scope || me, me.childNodes);
                                    }
                                });
                            }
                        }

                        if (!collapsing && callback) {
                            Ext.callback(callback, scope || me, me.childNodes);
                        }
                    }
                };
            }
        }
    });