この例では、ButtonCellを作成し、それを最初のAlternatingRowに割り当てます。
FarPoint.Web.Spread.ButtonCellType btncell = new FarPoint.Web.Spread.ButtonCellType();
FpSpread1.Sheets[0].AlternatingRows[0].CellType = btncell;
Dim btncell As New FarPoint.Web.Spread.ButtonCellType()
FpSpread1.Sheets(0).AlternatingRows(0).CellType = btncell