This event is fired at the source control when the user starts a drag-and-drop operation. The data object to be used for drag and drop is passed in to the event-handler as DataObject and represents a SAP Data Object.

If you code an event-handler for this event, your code can fill DataObject with the appropriate data, and set the Handled flag to TRUE. In this case, any default event processing by the control is disabled.

If your event-handler does not set Handled to TRUE, the control performs default event-handling. This includes adding the selected data to the data object using the format CF_TEXT. Any data previously stored in the data object using this format is overwritten.