FarPoint.Web.Spread.Extender.MaskedEditCellType m = new FarPoint.Web.Spread.Extender.MaskedEditCellType();
m.Editor.BackColor = Drawing.Color.Beige;
m.Editor.BorderWidth = 1;
m.ShowEditor = true;
m.MaskType = AjaxControlToolkit.MaskedEditType.Number;
m.Mask = "9,999,999.99";
m.DisplayMoney = AjaxControlToolkit.MaskedEditShowSymbol.Left;
m.ClearMaskOnLostFocus = true;
m.PromptCharacter = "#";
m.InputDirection = AjaxControlToolkit.MaskedEditInputDirection.LeftToRight;
FpSpread1.ActiveSheetView.Cells[0, 0].CellType = m;