System Reference Summary : 4. Events : ChildExpanded Event
 
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ChildExpanded Event
The ChildExpanded event is the same as the Expanded event (see page Exit Event), but it is sent to the parent of the TreeviewField.
on childexpanded [compositefieldname]
compositefieldname is optional if you specify the event in a script for a composite field, or if the composite field is the frame's top form.