or
((TreeNodeCheckBoxElement)e.NodeElement.Children[2]).CheckMarkPrimitive.CheckElement.ForeColor = Color.DarkGreen;GridViewGroupRowInfo groupHeader = (GridViewGroupRowInfo)_MyGrid.CurrentRow;
....
....
_MyGrid.Groups[groupHeader.Index].GroupRow.IsCurrent = true;_MyGrid.Groups[groupHeader.Index].GroupRow.IsSelected = true;