ChildLabelChanged Event
This event occurs when a TreeviewField or ListviewField node's label has been changed by the user editing the label text. It is the same as the
LabelChanged Event, but sent to the parent of the TreeviewField.
This event has the following syntax:
on childlabelchanged [treeviewfieldname | listviewfieldname]
The TriggerNode attribute identifies the node that was changed.