GrapeCity.Win.Spread.InputMan.CellType.CalculatorButtonStyleInfo cbs = new GrapeCity.Win.Spread.InputMan.CellType.CalculatorButtonStyleInfo();
cbs.BackColor = Color.Yellow;
cbs.ForeColor = Color.Magenta;
cbs.TextEffect = GrapeCity.Win.Spread.InputMan.CellType.TextEffect.Inset;
GrapeCity.Win.Spread.InputMan.CellType.GcNumberCellType ncell1 = new GrapeCity.Win.Spread.InputMan.CellType.GcNumberCellType();
ncell1.DropDownCalculator.FlatStyle = FlatStyle.Popup;
ncell1.DropDownCalculator.Font = new System.Drawing.Font("Comic Sans MS", 10);
ncell1.DropDownCalculator.MathButtons = cbs;
ncell1.DropDownCalculator.MemoryButtons = cbs;
fpSpread1.ActiveSheet.Cells[1, 1].CellType = ncell1;
fpSpread1.ActiveSheet.Cells[1, 1].Value = 12.31;