FarPoint.Win.Spread.CellType.MultiColumnComboBoxCellType mcb = new FarPoint.Win.Spread.CellType.MultiColumnComboBoxCellType();
mcb.BackgroundImage = null;
mcb.DataSourceList = ds;
mcb.DataColumn = 2;
mcb.ColumnEdit = 2;
mcb.AllowArrowKeysMoveActiveCell = FarPoint.Win.Spread.FlagArrowKeys.All;
mcb.ButtonAlign = FarPoint.Win.ButtonAlign.Left;
mcb.ListAlignment = FarPoint.Win.ListAlignment.Right;
mcb.ListWidth = 500;
mcb.ListOffset = 5;
mcb.MaxDrop = 5;
mcb.StringTrim = StringTrimming.EllipsisCharacter;
mcb.SubEditor = null;
fpSpread1.ActiveSheet.Cells[0, 0].CellType = mcb;