如何让cell里面的值竖排显示？？？

cell里面的值默认是横排显示，如何让cell里面的值竖排显示？？？

设置 TextOrientation  
       FarPoint.Win.Spread.CellType.TextCellType textCellType1 = new FarPoint.Win.Spread.CellType.TextCellType();
            textCellType1.TextOrientation = FarPoint.Win.TextOrientation.TextTopDown;
            this.fpSpread1_Sheet1.Cells.Get(4, 5).CellType = textCellType1;
            this.fpSpread1_Sheet1.Cells.Get(4, 5).Value = "自顶向下";