System Reference Summary : 4. Events : ChildDragBox Event
 
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ChildDragBox Event
The ChildDragBox event is triggered for a composite field when one of its child fields, set to a bias of FB_DRAGBOX, receives a DragBox event.
on childdragbox [compositefieldname]
compositefieldname is optional if you specify this event in a field script for a composite name, or if the composite field is the frame's top form.