private void gvMain_CustomDrawCell(object sender, DevExpress.XtraGrid.Views.Base.RowCellCustomDrawEventArgs e)        {            if (gvMain.IsMasterRowEmpty(e.RowHandle) == true && e.Column.VisibleIndex == 0)            {                var ce = ((DevExpress.XtraGrid.Views.Grid.ViewInfo.GridCellInfo)(e.Cell));                ce.CellButtonRect = Rectangle.FromLTRB(0, 0, 0, 0);            }        }