void LoadExpandedMasterRows() { for (int i = 0; i < gridControl.DataController.ListSourceRowCount; i++) { var rowHandle = gridControl.GetRowHandleByListIndex(i); gridControl.CollapseMasterRow(rowHandle); } foreach (var key in MasterRowList) { var test = GetRowHandleByKey(key); var datarow = gridControl.DataController.GetRow(0); gridControl.ExpandMasterRow(GetRowHandleByKey(key)); } }