    /**
     * @author Nicolas Ferrero
     *
     * TablePanel is the basis of both {@link Ext.tree.Panel TreePanel} and {@link Ext.grid.Panel GridPanel}.
     *
     * TablePanel aggregates:
     *
     *  - a Selection Model
     *  - a View
     *  - a Store
     *  - Scrollers
     *  - Ext.grid.header.Container
     */
    Ext.define('Ext.panel.Table', {
        extend: 'Ext.panel.Panel',

        alias: 'widget.tablepanel',

        uses: [
            'Ext.selection.RowModel',
            'Ext.grid.PagingScroller',
            'Ext.grid.header.Container',
            'Ext.grid.Lockable'
        ],

        extraBaseCls: Ext.baseCSSPrefix + 'grid',
        extraBodyCls: Ext.baseCSSPrefix + 'grid-body',

        layout: 'fit',
        /**
         * @property {Boolean} hasView
         * True to indicate that a view has been injected into the panel.
         */
        hasView: false,

        // each panel should dictate what viewType and selType to use
        /**
         * @cfg {String} viewType
         * An xtype of view to use. This is automatically set to 'gridview' by {@link Ext.grid.Panel Grid}
         * and to 'treeview' by {@link Ext.tree.Panel Tree}.
         */
        viewType: null,

        /**
         * @cfg {Object} viewConfig
         * A config object that will be applied to the grid's UI view. Any of the config options available for
         * {@link Ext.view.Table} can be specified here. This option is ignored if {@link #view} is specified.
         */

        /**
         * @cfg {Ext.view.Table} view
         * The {@link Ext.view.Table} used by the grid. Use {@link #viewConfig} to just supply some config options to
         * view (instead of creating an entire View instance).
         */

        /**
         * @cfg {String} selType
         * An xtype of selection model to use. Defaults to 'rowmodel'. This is used to create selection model if just
         * a config object or nothing at all given in {@link #selModel} config.
         */
        selType: 'rowmodel',

        /**
         * @cfg {Ext.selection.Model/Object} selModel
         * A {@link Ext.selection.Model selection model} instance or config object.  In latter case the {@link #selType}
         * config option determines to which type of selection model this config is applied.
         */

        /**
         * @cfg {Boolean} multiSelect
         * True to enable 'MULTI' selection mode on selection model. See {@link Ext.selection.Model#mode}.
         */

        /**
         * @cfg {Boolean} simpleSelect
         * True to enable 'SIMPLE' selection mode on selection model. See {@link Ext.selection.Model#mode}.
         */

        /**
         * @cfg {Ext.data.Store} store (required)
         * The {@link Ext.data.Store Store} the grid should use as its data source.
         */

        /**
         * @cfg {String/Boolean} scroll
         * Scrollers configuration. Valid values are 'both', 'horizontal' or 'vertical'.
         * True implies 'both'. False implies 'none'.
         */
        scroll: true,

        /**
         * @cfg {Ext.grid.column.Column[]/Object} columns
         * An array of {@link Ext.grid.column.Column column} definition objects which define all columns that appear in this
         * grid. Each column definition provides the header text for the column, and a definition of where the data for that
         * column comes from.
         *
         * This can also be a configuration object for a {Ext.grid.header.Container HeaderContainer} which may override
         * certain default configurations if necessary. For example, the special layout may be overridden to use a simpler
         * layout, or one can set default values shared by all columns:
         *
         *     columns: {
         *         items: [
         *             {
         *                 text: "Column A"
         *                 dataIndex: "field_A"
         *             },{
         *                 text: "Column B",
         *                 dataIndex: "field_B"
         *             },
         *             ...
         *         ],
         *         defaults: {
         *             flex: 1
         *         }
         *     }
         */

        /**
         * @cfg {Boolean} forceFit
         * Ttrue to force the columns to fit into the available width. Headers are first sized according to configuration,
         * whether that be a specific width, or flex. Then they are all proportionally changed in width so that the entire
         * content width is used.
         */

        /**
         * @cfg {Ext.grid.feature.Feature[]} features
         * An array of grid Features to be added to this grid. See {@link Ext.grid.feature.Feature} for usage.
         */

        /**
         * @cfg {Boolean} [hideHeaders=false]
         * True to hide column headers.
         */

        /**
         * @cfg {Boolean} deferRowRender
         * Defaults to true to enable deferred row rendering.
         *
         * This allows the View to execute a refresh quickly, with the expensive update of the row structure deferred so
         * that layouts with GridPanels appear, and lay out more quickly.
         */

        /**
         * @cfg {Object} verticalScroller
         * A config object to be used when configuring the {@link Ext.grid.PagingScroller scroll monitor} to control
         * refreshing of data in an "infinite grid".
         *
         * Configurations of this object allow fine tuning of data caching which can improve performance and usability
         * of the infinite grid.
         */

        deferRowRender: true,

        /**
         * @cfg {Boolean} sortableColumns
         * False to disable column sorting via clicking the header and via the Sorting menu items.
         */
        sortableColumns: true,

        /**
         * @cfg {Boolean} [enableLocking=false]
         * True to enable locking support for this grid. Alternatively, locking will also be automatically
         * enabled if any of the columns in the column configuration contain the locked config option.
         */
        enableLocking: false,

        // private property used to determine where to go down to find views
        // this is here to support locking.
        scrollerOwner: true,

        /**
         * @cfg {Boolean} [enableColumnMove=true]
         * False to disable column dragging within this grid.
         */
        enableColumnMove: true,

        /**
         * @cfg {Boolean} [restrictColumnReorder=false]
         * True to constrain column dragging so that a column cannot be dragged in or out of it's
         * current group. Only relevant while {@link #enableColumnMove} is enabled.
         */
        restrictColumnReorder: false,

        /**
         * @cfg {Boolean} [enableColumnResize=true]
         * False to disable column resizing within this grid.
         */
        enableColumnResize: true,

        /**
         * @cfg {Boolean} [enableColumnHide=true]
         * False to disable column hiding within this grid.
         */
        enableColumnHide: true,

        /**
         * @cfg {Boolean} columnLines Adds column line styling
         */

        /**
         * @cfg {Boolean} [rowLines=true] Adds row line styling
         */
        rowLines: true,

        /**
         * @cfg {Boolean} [disableSelection=false]
         * True to disable selection model.
         */

        /**
         * @cfg {String} emptyText Default text (html tags are accepted) to display in the Panel body when the Store
         * is empty. When specified, and the Store is empty, the text will be rendered inside a DIV with the CSS class "x-grid-empty".
         */

        /**
         * @property {Boolean} optimizedColumnMove
         * If you are writing a grid plugin or a {Ext.grid.feature.Feature Feature} which creates a column-based structure which
         * needs a view refresh when columns are moved, then set this property in the grid.
         *
         * An example is the built in {@link Ext.grid.feature.AbstractSummary Summary} Feature. This creates summary rows, and the
         * summary columns must be in the same order as the data columns. This plugin sets the `optimizedColumnMove` to `false.
         */

        initComponent: function() {
            //<debug>
            if (!this.viewType) {
                Ext.Error.raise("You must specify a viewType config.");
            }
            if (this.headers) {
                Ext.Error.raise("The headers config is not supported. Please specify columns instead.");
            }
            //</debug>

            var me          = this,
                scroll      = me.scroll,
                vertical    = false,
                horizontal  = false,
                headerCtCfg = me.columns || me.colModel,
                view,
                border = me.border,
                i, len;

            if (me.columnLines) {
                me.addCls(Ext.baseCSSPrefix + 'grid-with-col-lines');
            }

            if (me.rowLines) {
                me.addCls(Ext.baseCSSPrefix + 'grid-with-row-lines');
            }

            // Look up the configured Store. If none configured, use the fieldless, empty Store defined in Ext.data.Store.
            me.store = Ext.data.StoreManager.lookup(me.store || 'ext-empty-store');

            //<debug>
            if (!headerCtCfg) {
                Ext.Error.raise("A column configuration must be specified");
            }
            //</debug>

            // The columns/colModel config may be either a fully instantiated HeaderContainer, or an array of Column definitions, or a config object of a HeaderContainer
            // Either way, we extract a columns property referencing an array of Column definitions.
            if (headerCtCfg instanceof Ext.grid.header.Container) {
                me.headerCt = headerCtCfg;
                me.headerCt.border = border;
                me.columns = me.headerCt.items.items;
            } else {
                if (Ext.isArray(headerCtCfg)) {
                    headerCtCfg = {
                        items: headerCtCfg,
                        border: border
                    };
                }
                Ext.apply(headerCtCfg, {
                    forceFit: me.forceFit,
                    sortable: me.sortableColumns,
                    enableColumnMove: me.enableColumnMove,
                    enableColumnResize: me.enableColumnResize,
                    enableColumnHide: me.enableColumnHide,
                    border:  border,
                    restrictReorder: me.restrictColumnReorder
                });
                me.columns = headerCtCfg.items;

                 // If any of the Column objects contain a locked property, and are not processed, this is a lockable TablePanel, a
                 // special view will be injected by the Ext.grid.Lockable mixin, so no processing of .
                 if (me.enableLocking || Ext.ComponentQuery.query('{locked !== undefined}{processed != true}', me.columns).length) {
                     me.self.mixin('lockable', Ext.grid.Lockable);
                     me.injectLockable();
                 }
            }

            me.scrollTask = new Ext.util.DelayedTask(me.syncHorizontalScroll, me);

            me.addEvents(
                // documented on GridPanel
                'reconfigure',
                /**
                 * @event viewready
                 * Fires when the grid view is available (use this for selecting a default row).
                 * @param {Ext.panel.Table} this
                 */
                'viewready'
            );

            me.bodyCls = me.bodyCls || '';
            me.bodyCls += (' ' + me.extraBodyCls);

            me.cls = me.cls || '';
            me.cls += (' ' + me.extraBaseCls);

            // autoScroll is not a valid configuration
            delete me.autoScroll;

            // If this TablePanel is lockable (Either configured lockable, or any of the defined columns has a 'locked' property)
            // than a special lockable view containing 2 side-by-side grids will have been injected so we do not need to set up any UI.
            if (!me.hasView) {

                // If we were not configured with a ready-made headerCt (either by direct config with a headerCt property, or by passing
                // a HeaderContainer instance as the 'columns' property, then go ahead and create one from the config object created above.
                if (!me.headerCt) {
                    me.headerCt = new Ext.grid.header.Container(headerCtCfg);
                }

                // Extract the array of Column objects
                me.columns = me.headerCt.items.items;

                // If the Store is paging blocks of the dataset in, then it can only be sorted remotely.
                if (me.store.buffered && !me.store.remoteSort) {
                    for (i = 0, len = me.columns.length; i < len; i++) {
                        me.columns[i].sortable = false;
                    }
                }

                if (me.hideHeaders) {
                    me.headerCt.height = 0;
                    me.headerCt.addCls(Ext.baseCSSPrefix + 'grid-header-ct-hidden');
                    me.addCls(Ext.baseCSSPrefix + 'grid-header-hidden');
                    // IE Quirks Mode fix
                    // If hidden configuration option was used, several layout calculations will be bypassed.
                    if (Ext.isIEQuirks) {
                        me.headerCt.style = {
                            display: 'none'
                        };
                    }
                }

                // turn both on.
                if (scroll === true || scroll === 'both') {
                    vertical = horizontal = true;
                } else if (scroll === 'horizontal') {
                    horizontal = true;
                } else if (scroll === 'vertical') {
                    vertical = true;
                }

                me.relayHeaderCtEvents(me.headerCt);
                me.features = me.features || [];
                if (!Ext.isArray(me.features)) {
                    me.features = [me.features];
                }
                me.dockedItems = [].concat(me.dockedItems || []);
                me.dockedItems.unshift(me.headerCt);
                me.viewConfig = me.viewConfig || {};

                // Buffered scrolling must preserve scroll on refresh
                if (me.store && me.store.buffered) {
                    me.viewConfig.preserveScrollOnRefresh = true;
                } else if (me.invalidateScrollerOnRefresh !== undefined) {
                    me.viewConfig.preserveScrollOnRefresh = !me.invalidateScrollerOnRefresh;
                }

                // AbstractDataView will look up a Store configured as an object
                // getView converts viewConfig into a View instance
                view = me.getView();

                me.items = [view];
                me.hasView = true;

                if (vertical) {
                    // If the Store is buffered, create a PagingScroller to monitor the View's scroll progress,
                    // load the Store's prefetch buffer when it detects we are nearing an edge.
                    if (me.store.buffered) {
                        me.verticalScroller = new Ext.grid.PagingScroller(Ext.apply({
                            panel: me,
                            store: me.store,
                            view: me.view
                        }, me.verticalScroller));
                    }
                }

                if (horizontal) {
                    // Add a listener to synchronize the horizontal scroll position of the headers
                    // with the table view's element... Unless we are not showing headers!
                    if (!me.hideHeaders) {
                        view.on({
                            scroll: {
                                fn: me.onHorizontalScroll,
                                element: 'el',
                                scope: me
                            }
                        });
                    }
                }

                me.mon(view.store, {
                    load: me.onStoreLoad,
                    scope: me
                });
                me.mon(view, {
                    viewready: me.onViewReady,
                    refresh: me.onRestoreHorzScroll,
                    scope: me
                });
            }

            // Relay events from the View whether it be a LockingView, or a regular GridView
            this.relayEvents(me.view, [
                /**
                 * @event beforeitemmousedown
                 * @inheritdoc Ext.view.View#beforeitemmousedown
                 */
                'beforeitemmousedown',
                /**
                 * @event beforeitemmouseup
                 * @inheritdoc Ext.view.View#beforeitemmouseup
                 */
                'beforeitemmouseup',
                /**
                 * @event beforeitemmouseenter
                 * @inheritdoc Ext.view.View#beforeitemmouseenter
                 */
                'beforeitemmouseenter',
                /**
                 * @event beforeitemmouseleave
                 * @inheritdoc Ext.view.View#beforeitemmouseleave
                 */
                'beforeitemmouseleave',
                /**
                 * @event beforeitemclick
                 * @inheritdoc Ext.view.View#beforeitemclick
                 */
                'beforeitemclick',
                /**
                 * @event beforeitemdblclick
                 * @inheritdoc Ext.view.View#beforeitemdblclick
                 */
                'beforeitemdblclick',
                /**
                 * @event beforeitemcontextmenu
                 * @inheritdoc Ext.view.View#beforeitemcontextmenu
                 */
                'beforeitemcontextmenu',
                /**
                 * @event itemmousedown
                 * @inheritdoc Ext.view.View#itemmousedown
                 */
                'itemmousedown',
                /**
                 * @event itemmouseup
                 * @inheritdoc Ext.view.View#itemmouseup
                 */
                'itemmouseup',
                /**
                 * @event itemmouseenter
                 * @inheritdoc Ext.view.View#itemmouseenter
                 */
                'itemmouseenter',
                /**
                 * @event itemmouseleave
                 * @inheritdoc Ext.view.View#itemmouseleave
                 */
                'itemmouseleave',
                /**
                 * @event itemclick
                 * @inheritdoc Ext.view.View#itemclick
                 */
                'itemclick',
                /**
                 * @event itemdblclick
                 * @inheritdoc Ext.view.View#itemdblclick
                 */
                'itemdblclick',
                /**
                 * @event itemcontextmenu
                 * @inheritdoc Ext.view.View#itemcontextmenu
                 */
                'itemcontextmenu',
                /**
                 * @event beforecontainermousedown
                 * @inheritdoc Ext.view.View#beforecontainermousedown
                 */
                'beforecontainermousedown',
                /**
                 * @event beforecontainermouseup
                 * @inheritdoc Ext.view.View#beforecontainermouseup
                 */
                'beforecontainermouseup',
                /**
                 * @event beforecontainermouseover
                 * @inheritdoc Ext.view.View#beforecontainermouseover
                 */
                'beforecontainermouseover',
                /**
                 * @event beforecontainermouseout
                 * @inheritdoc Ext.view.View#beforecontainermouseout
                 */
                'beforecontainermouseout',
                /**
                 * @event beforecontainerclick
                 * @inheritdoc Ext.view.View#beforecontainerclick
                 */
                'beforecontainerclick',
                /**
                 * @event beforecontainerdblclick
                 * @inheritdoc Ext.view.View#beforecontainerdblclick
                 */
                'beforecontainerdblclick',
                /**
                 * @event beforecontainercontextmenu
                 * @inheritdoc Ext.view.View#beforecontainercontextmenu
                 */
                'beforecontainercontextmenu',
                /**
                 * @event containermouseup
                 * @inheritdoc Ext.view.View#containermouseup
                 */
                'containermouseup',
                /**
                 * @event containermouseover
                 * @inheritdoc Ext.view.View#containermouseover
                 */
                'containermouseover',
                /**
                 * @event containermouseout
                 * @inheritdoc Ext.view.View#containermouseout
                 */
                'containermouseout',
                /**
                 * @event containerclick
                 * @inheritdoc Ext.view.View#containerclick
                 */
                'containerclick',
                /**
                 * @event containerdblclick
                 * @inheritdoc Ext.view.View#containerdblclick
                 */
                'containerdblclick',
                /**
                 * @event containercontextmenu
                 * @inheritdoc Ext.view.View#containercontextmenu
                 */
                'containercontextmenu',
                /**
                 * @event selectionchange
                 * @inheritdoc Ext.selection.Model#selectionchange
                 */
                'selectionchange',
                /**
                 * @event beforeselect
                 * @inheritdoc Ext.selection.RowModel#beforeselect
                 */
                'beforeselect',
                /**
                 * @event select
                 * @inheritdoc Ext.selection.RowModel#select
                 */
                'select',
                /**
                 * @event beforedeselect
                 * @inheritdoc Ext.selection.RowModel#beforedeselect
                 */
                'beforedeselect',
                /**
                 * @event deselect
                 * @inheritdoc Ext.selection.RowModel#deselect
                 */
                'deselect'
            ]);

            me.callParent(arguments);
            me.addStateEvents(['columnresize', 'columnmove', 'columnhide', 'columnshow', 'sortchange']);

            if (me.headerCt) {
                me.headerCt.on('afterlayout', me.onRestoreHorzScroll, me);
            }
        },

        relayHeaderCtEvents: function (headerCt) {
            this.relayEvents(headerCt, [
                /**
                 * @event columnresize
                 * @inheritdoc Ext.grid.header.Container#columnresize
                 */
                'columnresize',
                /**
                 * @event columnmove
                 * @inheritdoc Ext.grid.header.Container#columnmove
                 */
                'columnmove',
                /**
                 * @event columnhide
                 * @inheritdoc Ext.grid.header.Container#columnhide
                 */
                'columnhide',
                /**
                 * @event columnshow
                 * @inheritdoc Ext.grid.header.Container#columnshow
                 */
                'columnshow',
                /**
                 * @event sortchange
                 * @inheritdoc Ext.grid.header.Container#sortchange
                 */
                'sortchange'
            ]);
        },

        getState: function(){
            var me = this,
                state = me.callParent(),
                sorter = me.store.sorters.first();

            state = me.addPropertyToState(state, 'columns', (me.headerCt || me).getColumnsState());

            if (sorter) {
                state = me.addPropertyToState(state, 'sort', {
                    property: sorter.property,
                    direction: sorter.direction,
                    root: sorter.root
                });
            }
            return state;
        },

        applyState: function(state) {
            var me = this,
                sorter = state.sort,
                store = me.store,
                columns = state.columns;

            delete state.columns;

            // Ensure superclass has applied *its* state.
            // AbstractComponent saves dimensions (and anchor/flex) plus collapsed state.
            me.callParent(arguments);

            if (columns) {
                (me.headerCt || me).applyColumnsState(columns);
            }

            if (sorter) {
                if (store.remoteSort) {
                    // Pass false to prevent a sort from occurring
                    store.sort({
                        property: sorter.property,
                        direction: sorter.direction,
                        root: sorter.root
                    }, null, false);
                } else {
                    store.sort(sorter.property, sorter.direction);
                }
            }
        },

        /**
         * Returns the store associated with this Panel.
         * @return {Ext.data.Store} The store
         */
        getStore: function(){
            return this.store;
        },

        /**
         * Gets the view for this panel.
         * @return {Ext.view.Table}
         */
        getView: function() {
            var me = this,
                sm;

            if (!me.view) {
                sm = me.getSelectionModel();
                me.view = Ext.widget(Ext.apply({}, me.viewConfig, {

                    // Features need a reference to the grid, so configure a reference into the View
                    grid: me,
                    deferInitialRefresh: me.deferRowRender !== false,
                    scroll: me.scroll,
                    xtype: me.viewType,
                    store: me.store,
                    headerCt: me.headerCt,
                    selModel: sm,
                    features: me.features,
                    panel: me,
                    emptyText : me.emptyText ? '<div class="' + Ext.baseCSSPrefix + 'grid-empty">' + me.emptyText + '</div>' : ''
                }));
                me.mon(me.view, {
                    uievent: me.processEvent,
                    scope: me
                });
                sm.view = me.view;
                me.headerCt.view = me.view;
                me.relayEvents(me.view, [
                    /**
                     * @event cellclick
                     * Fired when table cell is clicked.
                     * @param {Ext.view.Table} this
                     * @param {HTMLElement} td The TD element that was clicked.
                     * @param {Number} cellIndex
                     * @param {Ext.data.Model} record
                     * @param {HTMLElement} tr The TR element that was clicked.
                     * @param {Number} rowIndex
                     * @param {Ext.EventObject} e
                     */
                    'cellclick',
                    /**
                     * @event celldblclick
                     * Fired when table cell is double clicked.
                     * @param {Ext.view.Table} this
                     * @param {HTMLElement} td The TD element that was clicked.
                     * @param {Number} cellIndex
                     * @param {Ext.data.Model} record
                     * @param {HTMLElement} tr The TR element that was clicked.
                     * @param {Number} rowIndex
                     * @param {Ext.EventObject} e
                     */
                    'celldblclick'
                ]);
            }
            return me.view;
        },

        /**
         * @private
         * autoScroll is never valid for all classes which extend TablePanel.
         */
        setAutoScroll: Ext.emptyFn,

        /**
         * @private
         * Processes UI events from the view. Propagates them to whatever internal Components need to process them.
         * @param {String} type Event type, eg 'click'
         * @param {Ext.view.Table} view TableView Component
         * @param {HTMLElement} cell Cell HtmlElement the event took place within
         * @param {Number} recordIndex Index of the associated Store Model (-1 if none)
         * @param {Number} cellIndex Cell index within the row
         * @param {Ext.EventObject} e Original event
         */
        processEvent: function(type, view, cell, recordIndex, cellIndex, e) {
            var me = this,
                header;

            if (cellIndex !== -1) {
                header = me.headerCt.getGridColumns()[cellIndex];
                return header.processEvent.apply(header, arguments);
            }
        },

        /**
         * This method is obsolete in 4.1. The closest equivalent in
         * 4.1 is {@link #doLayout}, but it is also possible that no
         * layout is needed.
         * @deprecated 4.1
         */
        determineScrollbars: function () {
            //<debug>
            Ext.log.warn('Obsolete');
            //</debug>
        },

        /**
         * This method is obsolete in 4.1. The closest equivalent in 4.1 is
         * {@link Ext.AbstractComponent#updateLayout}, but it is also possible that no layout
         * is needed.
         * @deprecated 4.1
         */
        invalidateScroller: function () {
            //<debug>
            Ext.log.warn('Obsolete');
            //</debug>
        },

        scrollByDeltaY: function(yDelta, animate) {
            this.getView().scrollBy(0, yDelta, animate);
        },

        scrollByDeltaX: function(xDelta, animate) {
            this.getView().scrollBy(xDelta, 0, animate);
        },

        afterCollapse: function() {
            var me = this;
            me.saveScrollPos();
            me.saveScrollPos();
            me.callParent(arguments);
        },

        afterExpand: function() {
            var me = this;
            me.callParent(arguments);
            me.restoreScrollPos();
            me.restoreScrollPos();
        },

        saveScrollPos: Ext.emptyFn,

        restoreScrollPos: Ext.emptyFn,

        onHeaderResize: function(){
            this.delayScroll();
        },

        // Update the view when a header moves
        onHeaderMove: function(headerCt, header, colsToMove, fromIdx, toIdx) {
            var me = this;

            // If there are Features or Plugins which create DOM which must match column order, they set the optimizedColumnMove flag to false.
            // In this case we must refresh the view on column move.
            if (me.optimizedColumnMove === false) {
                me.view.refresh();
            }

            // Simplest case for default DOM structure is just to swap the columns round in the view.
            else {
                me.view.moveColumn(fromIdx, toIdx, colsToMove);
            }
            me.delayScroll();
        },

        // Section onHeaderHide is invoked after view.
        onHeaderHide: function(headerCt, header) {
            this.delayScroll();
        },

        onHeaderShow: function(headerCt, header) {
            this.delayScroll();
        },

        delayScroll: function(){
            var target = this.getScrollTarget().el;
            if (target) {
                this.scrollTask.delay(10, null, null, [target.dom.scrollLeft]);
            }
        },

        /**
         * @private
         * Fires the TablePanel's viewready event when the view declares that its internal DOM is ready
         */
        onViewReady: function() {
             this.fireEvent('viewready', this);
        },

        /**
         * @private
         * Tracks when things happen to the view and preserves the horizontal scroll position.
         */
        onRestoreHorzScroll: function() {
            var left = this.scrollLeftPos;
            if (left) {
                this.syncHorizontalScroll(left);
            }
        },

        /**
         * Sets the scrollTop of the TablePanel.
         * @param {Number} top
         */
        setScrollTop: function(top) {
            var me               = this,
                rootCmp          = me.getScrollerOwner();

            rootCmp.virtualScrollTop = top;
        },

        getScrollerOwner: function() {
            var rootCmp = this;
            if (!this.scrollerOwner) {
                rootCmp = this.up('[scrollerOwner]');
            }
            return rootCmp;
        },

        /**
         * Gets left hand side marker for header resizing.
         * @private
         */
        getLhsMarker: function() {
            var me = this;
            return me.lhsMarker || (me.lhsMarker = Ext.DomHelper.append(me.el, {
                    cls: Ext.baseCSSPrefix + 'grid-resize-marker'
                }, true));
        },

        /**
         * Gets right hand side marker for header resizing.
         * @private
         */
        getRhsMarker: function() {
            var me = this;

            return me.rhsMarker || (me.rhsMarker = Ext.DomHelper.append(me.el, {
                    cls: Ext.baseCSSPrefix + 'grid-resize-marker'
                }, true));
        },

        /**
         * Returns the selection model being used and creates it via the configuration if it has not been created already.
         * @return {Ext.selection.Model} selModel
         */
        getSelectionModel: function(){
            if (!this.selModel) {
                this.selModel = {};
            }

            var mode = 'SINGLE',
                type;
            if (this.simpleSelect) {
                mode = 'SIMPLE';
            } else if (this.multiSelect) {
                mode = 'MULTI';
            }

            Ext.applyIf(this.selModel, {
                allowDeselect: this.allowDeselect,
                mode: mode
            });

            if (!this.selModel.events) {
                type = this.selModel.selType || this.selType;
                this.selModel = Ext.create('selection.' + type, this.selModel);
            }

            if (!this.selModel.hasRelaySetup) {
                this.relayEvents(this.selModel, [
                    'selectionchange', 'beforeselect', 'beforedeselect', 'select', 'deselect'
                ]);
                this.selModel.hasRelaySetup = true;
            }

            // lock the selection model if user
            // has disabled selection
            if (this.disableSelection) {
                this.selModel.locked = true;
            }
            return this.selModel;
        },

        getScrollTarget: function(){
            var owner = this.getScrollerOwner(),
                items = owner.query('tableview');

            return items[1] || items[0];
        },

        onHorizontalScroll: function(event, target) {
            this.syncHorizontalScroll(target.scrollLeft);
        },

        syncHorizontalScroll: function(left) {
            var me = this,
                scrollTarget;

            if (me.rendered) {
                scrollTarget = me.getScrollTarget();
                scrollTarget.el.dom.scrollLeft = left;
                me.headerCt.el.dom.scrollLeft = left;
                me.scrollLeftPos = left;
            }
        },

        // template method meant to be overriden
        onStoreLoad: Ext.emptyFn,

        getEditorParent: function() {
            return this.body;
        },

        bindStore: function(store) {
            var me = this;
            me.store = store;
            me.getView().bindStore(store);
        },

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

        // documented on GridPanel
        reconfigure: function(store, columns) {
            var me = this,
                headerCt = me.headerCt;

            if (me.lockable) {
                me.reconfigureLockable(store, columns);
            } else {
                if (columns) {
                    // new columns, delete scroll pos
                    delete me.scrollLeftPos;
                    headerCt.suspendLayouts();
                    headerCt.removeAll();
                    headerCt.add(columns);
                }
                if (store) {
                    store = Ext.StoreManager.lookup(store);
                    me.bindStore(store);
                } else {
                    me.getView().refresh();
                }
                if (columns) {
                    headerCt.resumeLayouts(true);
                }
                headerCt.setSortState();
            }
            me.fireEvent('reconfigure', me, store, columns);
        }
    });