System Reference Summary : Events : ChildDragDrop Event
 
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ChildDragDrop Event
A ChildDragDrop event occurs when a user is dragging an object and releases the primary mouse button over a field that will accept the object being dragged.
on childdragdrop [compositefieldname]
If compositefieldname is specified, the event occurs only if the drop operation ends over a child of the specified composite field.