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You can display a pop-up calendar in the date-time cell as shown in the following image.
Set the ShowPopupButton property to True to display the calendar. Double-click the cell to enter edit mode and then click or tap on the drop-down button to show the calendar. Select a date and then press the Enter key to finish editing the cell.
This example allows the calendar to be displayed.
FarPoint.Web.Spread.DateTimeCellType datecell = new FarPoint.Web.Spread.DateTimeCellType();
datecell.ShowPopupButton = true;
FpSpread1.ActiveSheetView.Columns[1].Width = 175;
FpSpread1.ActiveSheetView.Cells[1,1].CellType = datecell;
Dim datecell As New FarPoint.Web.Spread.DateTimeCellType()
datecell.ShowPopupButton = True
FpSpread1.ActiveSheetView.Columns(1).Width = 175
FpSpread1.ActiveSheetView.Cells(1, 1).CellType = datecell