    /**
     * Node Store
     * @private
     */
    Ext.define('Ext.data.NodeStore', {
        extend: 'Ext.data.Store',
        alias: 'store.node',
        requires: ['Ext.data.NodeInterface'],

        /**
         * @cfg {Ext.data.Model} node
         * The Record you want to bind this Store to. Note that
         * this record will be decorated with the Ext.data.NodeInterface if this is not the
         * case yet.
         */
        node: null,

        /**
         * @cfg {Boolean} recursive
         * Set this to true if you want this NodeStore to represent
         * all the descendents of the node in its flat data collection. This is useful for
         * rendering a tree structure to a DataView and is being used internally by
         * the TreeView. Any records that are moved, removed, inserted or appended to the
         * node at any depth below the node this store is bound to will be automatically
         * updated in this Store's internal flat data structure.
         */
        recursive: false,

        /**
         * @cfg {Boolean} rootVisible
         * False to not include the root node in this Stores collection.
         */
        rootVisible: false,

        /**
         * @cfg {Ext.data.TreeStore} treeStore
         * The TreeStore that is used by this NodeStore's Ext.tree.View.
         */

        constructor: function(config) {
            var me = this,
                node;

            config = config || {};
            Ext.apply(me, config);

            //<debug>
            if (Ext.isDefined(me.proxy)) {
                Ext.Error.raise("A NodeStore cannot be bound to a proxy. Instead bind it to a record " +
                                "decorated with the NodeInterface by setting the node config.");
            }
            me.useModelWarning = false;
            //</debug>

            config.proxy = {type: 'proxy'};
            me.callParent([config]);

            node = me.node;
            if (node) {
                me.node = null;
                me.setNode(node);
            }
        },

        setNode: function(node) {
            var me = this;
            if (me.node && me.node != node) {
                // We want to unbind our listeners on the old node
                me.mun(me.node, {
                    expand: me.onNodeExpand,
                    collapse: me.onNodeCollapse,
                    append: me.onNodeAppend,
                    insert: me.onNodeInsert,
                    remove: me.onNodeRemove,
                    sort: me.onNodeSort,
                    scope: me
                });
                me.node = null;
            }

            if (node) {
                Ext.data.NodeInterface.decorate(node.self);
                me.removeAll();
                if (me.rootVisible) {
                    me.add(node);
                } else if (!node.isExpanded() && me.treeStore.autoLoad !== false) {
                    node.expand();
                }

                me.mon(node, {
                    expand: me.onNodeExpand,
                    collapse: me.onNodeCollapse,
                    append: me.onNodeAppend,
                    insert: me.onNodeInsert,
                    remove: me.onNodeRemove,
                    sort: me.onNodeSort,
                    scope: me
                });
                me.node = node;
                if (node.isExpanded() && node.isLoaded()) {
                    me.onNodeExpand(node, node.childNodes, true);
                }
            }
        },

        onNodeSort: function(node, childNodes) {
            var me = this;

            if ((me.indexOf(node) !== -1 || (node === me.node && !me.rootVisible) && node.isExpanded())) {
                me.onNodeCollapse(node, childNodes, true);
                me.onNodeExpand(node, childNodes, true);
            }
        },

        onNodeExpand: function(parent, records, suppressEvent) {
            var me = this,
                insertIndex = me.indexOf(parent) + 1,
                ln = records ? records.length : 0,
                i, record;

            if (!me.recursive && parent !== me.node) {
                return;
            }

            if (parent !== this.node && !me.isVisible(parent)) {
                return;
            }

            if (!suppressEvent && me.fireEvent('beforeexpand', parent, records, insertIndex) === false) {
                return;
            }

            if (ln) {
                me.insert(insertIndex, records);
                for (i = 0; i < ln; i++) {
                    record = records[i];
                    if (record.isExpanded()) {
                        if (record.isLoaded()) {
                            // Take a shortcut
                            me.onNodeExpand(record, record.childNodes, true);
                        }
                        else {
                            record.set('expanded', false);
                            record.expand();
                        }
                    }
                }
            }

            if (!suppressEvent) {
                me.fireEvent('expand', parent, records);
            }
        },

        onNodeCollapse: function(parent, records, suppressEvent) {
            var me = this,
                ln = records.length,
                collapseIndex = me.indexOf(parent) + 1,
                i, record;

            if (!me.recursive && parent !== me.node) {
                return;
            }

            if (!suppressEvent && me.fireEvent('beforecollapse', parent, records, collapseIndex) === false) {
                return;
            }

            for (i = 0; i < ln; i++) {
                record = records[i];
                me.remove(record);
                if (record.isExpanded()) {
                    me.onNodeCollapse(record, record.childNodes, true);
                }
            }

            if (!suppressEvent) {
                me.fireEvent('collapse', parent, records, collapseIndex);
            }
        },

        onNodeAppend: function(parent, node, index) {
            var me = this,
                refNode, sibling;

            if (me.isVisible(node)) {
                if (index === 0) {
                    refNode = parent;
                } else {
                    sibling = node.previousSibling;
                    while (sibling.isExpanded() && sibling.lastChild) {
                        sibling = sibling.lastChild;
                    }
                    refNode = sibling;
                }
                me.insert(me.indexOf(refNode) + 1, node);
                if (!node.isLeaf() && node.isExpanded()) {
                    if (node.isLoaded()) {
                        // Take a shortcut
                        me.onNodeExpand(node, node.childNodes, true);
                    }
                    else {
                        node.set('expanded', false);
                        node.expand();
                    }
                }
            }
        },

        onNodeInsert: function(parent, node, refNode) {
            var me = this,
                index = this.indexOf(refNode);

            if (index != -1 && me.isVisible(node)) {
                me.insert(index, node);
                if (!node.isLeaf() && node.isExpanded()) {
                    if (node.isLoaded()) {
                        // Take a shortcut
                        me.onNodeExpand(node, node.childNodes, true);
                    }
                    else {
                        node.set('expanded', false);
                        node.expand();
                    }
                }
            }
        },

        onNodeRemove: function(parent, node, index) {
            var me = this;
            if (me.indexOf(node) != -1) {
                if (!node.isLeaf() && node.isExpanded()) {
                    me.onNodeCollapse(node, node.childNodes, true);
                }
                me.remove(node);
            }
        },

        isVisible: function(node) {
            var parent = node.parentNode;
            while (parent) {
                if (parent === this.node && !this.rootVisible && parent.isExpanded()) {
                    return true;
                }

                if (this.indexOf(parent) === -1 || !parent.isExpanded()) {
                    return false;
                }

                parent = parent.parentNode;
            }
            return true;
        }
    });