code: function(oTable, oRef, bExpand) {
  			var $Ref = jQuery(oRef);
  			var $GroupRef;
  
  			if ($Ref.hasClass("sapUiTableTreeIcon") || (TableGrouping.isTreeMode(oTable) && $Ref.hasClass("sapUiTableCellFirst"))) {
  				$GroupRef = $Ref.closest("tr", oTable.getDomRef());
  			} else {
  				$GroupRef = $Ref.closest(".sapUiTableGroupHeader", oTable.getDomRef());
  			}
  
  			var oBinding = oTable.getBinding("rows");
  			if ($GroupRef.length > 0 && oBinding) {
  				var iGroupHeaderRowIndex = +$GroupRef.attr("data-sap-ui-rowindex");
  				var oRow = oTable.getRows()[iGroupHeaderRowIndex];
  
  				if (oRow) {
  					var iAbsoluteRowIndex = oRow.getIndex();
  					var bIsExpanded = TableGrouping.toggleGroupHeader(oTable, iAbsoluteRowIndex, bExpand);
  					var bChanged = bIsExpanded === true || bIsExpanded === false;
  
  					if (bChanged && oTable._onGroupHeaderChanged) {
  						oTable._onGroupHeaderChanged(iAbsoluteRowIndex, bIsExpanded);
  					}
  
  					return bChanged;
  				}
  			}
  
  			return false;
  		}
docs: Toggles the expand / collapse state of the group which contains the given DOM element.
  
  @param {sap.ui.table.Table} oTable Instance of the table.
  @param {Object} oRef DOM reference of an element within the table group header
  @param {boolean} [bExpand] If defined instead of toggling the desired state is set.
  @returns {boolean} Whether the operation was performed.