| Part | Description | |
| object | Required. A valid object. | |
| fmShowDropButtonWhen | Optional. The circumstances under which the drop-down button will be visible. | |
| Constant | Value | Description | |
| fmShowDropButtonWhenNever | 0 | Do not show the drop-down button under any circumstances. | |
| fmShowDropButtonWhenFocus | 1 | Show the drop-down button when the control has the focus. | |
| fmShowDropButtonWhenAlways | 2 | Always show the drop-down button. | |