/** * A simple header component for grouped grids. Grid row headers are created automatically * by {@link Ext.grid.Grid Grids} and should not be directly instantiated. */Ext.define('Ext.grid.RowHeader', { extend: 'Ext.dataview.ItemHeader', xtype: 'rowheader', classCls: Ext.baseCSSPrefix + 'rowheader', manageWidth: false});