void ClearVariables()
{
focusedMasterKey = null;
focusedDetailKey = null;
focusedGroupValues = null;
SelectionList.Clear();
MasterRowList.Clear();
GroupRowList.Clear();
}
void SaveExpandedMasterRows()
{
MasterRowList.Clear();
for (int i = 0; i < gridControl.DataController.ListSourceRowCount; i++)
{
var rowHandle = gridControl.GetRowHandleByListIndex(i);
if (gridControl.IsMasterRowExpanded(rowHandle))
{
MasterRowList.Add(GetKeyByRowHandle(rowHandle));
}
}
}