次のサンプルコードは、TextOrientationプロパティを設定します。
FarPoint.Win.Spread.CellType.ButtonCellType butncell = new FarPoint.Win.Spread.CellType.ButtonCellType();
butncell.Text = "Click";
butncell.TextOrientation = FarPoint.Win.TextOrientation.TextVertical;
fpSpread1.Sheets[0].Cells[2, 2].CellType = butncell;
Dim butncell As New FarPoint.Win.Spread.CellType.ButtonCellType()
butncell.Text = "Click"
butncell.TextOrientation = FarPoint.Win.TextOrientation.TextVertical
FpSpread1.Sheets(0).Cells(2, 2).CellType = butncell