When setting up a notification on this attribute, RapaGUI will run your
event callback whenever a treeview item's value has changed because
the user has toggled the checkbox or has edited the item. Note that
Treeview.ValueChange will not trigger if the item's value
was changed using the Treeviewleaf.SetItem or Treeviewleaf.SetState
methods. It also won't trigger if Treeviewnode.Name was used
to change the item's label.
For items in checkbox columns, TriggerValue will be set to either
True or False, reflecting the new checkbox state. For items in text
columns, TriggerValue will contain the new item text.
Additionally, your event handler will be called with the following extra
arguments:
Item:-
ID of the item (node or leaf) whose value has changed.
Column:-
Column index of the item whose value has changed. For nodes this will always be 0.
See Notifications for details.