FarPoint.Web.Spread.Extender.TextBoxWatermarkCellType tb = new FarPoint.Web.Spread.Extender.TextBoxWatermarkCellType();
tb.WatermarkText = "Required";
tb.WatermarkCssClass = "watermarked";
FpSpread1.ActiveSheetView.Cells[0, 0].CellType = tb;
.watermarked {
    height:18px;
    width:150px;
    padding:2px 0 0 2px;
    border:1px solid #BEBEBE;
    background-color:#F0F8FF;
    color:gray;
}
	 
	
		Dim tb As New FarPoint.Web.Spread.Extender.TextBoxWatermarkCellType
tb.WatermarkText = "Required"
tb.WatermarkCssClass = "watermarked"
FpSpread1.ActiveSheetView.Cells(0, 0).CellType = tb
.watermarked {
    height:18px;
    width:150px;
    padding:2px 0 0 2px;
    border:1px solid #BEBEBE;
    background-color:#F0F8FF;
    color:gray;
}