code: function () {
          var renderData = this.callParent();
  
          if (this.owner.getHierarchyState().rtl) {
              renderData.innerCtCls =
                  (renderData.innerCtCls || '') + ' ' + Ext.baseCSSPrefix + 'rtl';
          }
          
          return renderData;
      }
docs: Override to put the RTL class onto the innerCt so that columns can have a rule which switches float direction