Configuring Drop On events

To configure events in the Drop On Events property:

With a form open and in Design Mode, select the component for which you want to enable drop-on handling.
In the [Component] property sheet for that component, select the [Events] tab.
Select the [Drop On Events] property and click the ellipsis ([...]) button to its right.
Use the [Edit Drop On Events] dialog box to assign one or more events to the [Drop On Events] property.

注: For the drag-and-drop operation to work, you must have a corresponding [Drag From Event] with the same event configured.