private void Detail_GridView_RowUpdated(object sender, DevExpress.XtraGrid.Views.Base.RowObjectEventArgs e)
        {
            VoucherCoverDetail row = e.Row.CastTo <VoucherCoverDetail>();
            bool isNewRow          = Detail_GridView.IsNewItemRow(e.RowHandle);

            if (isNewRow)
            {
                row.Status = ModifyMode.Insert;
                return;
            }

            if (row.Status == ModifyMode.Insert)
            {
                return;
            }

            row.Status = ModifyMode.Update;
        }