The event would be called from the listbox's Open event initially
(that's where the errors are being generated from right now), but
also from other methods and handlers within the owning window.
Making Update a method of the subclass doesn't work, because each
instance of the subclass will have a different method for updating.
Making Update an Event Definition of the subclass seemed to be the
solution, as then it can have a different algorithm for each instance
of the subclass. I could make Update a method of the Window and pass
the calling listbox as a parameter, which I'll do if there's no other
way, but if I can figure out how to call the Update event, then each
listbox instance could know how to update itself.
Thanks,
Chuck
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