The specialized C1Input controls for date-time and numeric editing, C1DateEdit and C1NumericEdit controls, support drop-down and increment/decrement (up/down) buttons. Button visibility is controlled by the ShowDropDownButton and ShowUpDownButtons properties.

To control drop-down alignment and distance from the control you can use the DropDownAlign and GapHeight properties. To open/close drop-down programmatically, use the OpenDropDown and CloseDropDown methods. Opening/closing drop-down triggers events DropDownOpened and DropDownClosed. You can use the DropDownOpened event to adjust drop-down properties (mostly, calendar properties in Calendar) before the drop-down is shown to the user. You can check if the drop-down is open using the DroppedDown property.