It allows you to code the activity of the element to be dragged.
Event control.Drag( [out:] ¶meter )
The name of the form control over the drag operation is performed.
The parameter is only one, and it is always an out variable.
Code associated with the event. The parameter will be loaded here with the data you want to drop into another control as a consequence of the drag operation. To drag several elements of the information you have to load them into an SDT, being the ¶meter variable.
Drag and Drop in Applications Sample 1
Drag and Drop in Web Applications
Drop event in Web