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 Occurs when a drag-and-drop operation is completed as a result of dragging a
 control over a form or control and releasing the mouse button or by using
 the DRAG method with action% = 2.
 
    SUB Form_DragDrop (Source AS CONTROL, X AS SINGLE, Y AS SINGLE)
    SUB ctlname_DragDrop ([Index AS INTEGER,] Source AS CONTROL, X AS SINGLE,
                           Y AS SINGLE)
 
    ■ Source  Source control being dragged. You can refer to properties and
              methods with the Source argument. For example:
 
                   Source.Visible = 0
 
    ■ X, Y    Current horizontal (X) and vertical (Y) positions of the mouse
              pointer within the target form or control.
 
    ■ Index   Uniquely identifies a control in a control array.
 
 Applies To
    ◄Check Box Control►                ◄Combo Box Control►
    ◄Command Button Control►           ◄Directory List Box Control►
    ◄Drive List Box Control►           ◄File List Box Control►
    ◄Form►                             ◄Frame Control►
    ◄Horizontal Scroll Bar Control►    ◄Label Control►
    ◄List Box Control►                 ◄Option Button Control►
    ◄Picture Box Control►              ◄Text Box Control►
    ◄Vertical Scroll Bar Control►
 
  See Also
    ◄DRAG Method►                      ◄DragMode Property►
    ◄DragOver Event►