Configuring Drag From events

To configure events in the Drag From Events property:

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

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