>I am creating a parent ComboBox class. I want it to automatically disable when nothing is in the combobox; in other words,
>
>ComboBox.Enabled = (ComboBox.ListCount > 0)
>
> I have tried putting the above code into the When, Requery, Refresh, ListCount_Access, ProgrammaticChange, and other methods, but nothing seems to work. None of them fire when the ListCount changes.
> How can I get it to enable/disable whenever the ListCount changes?

How about calling a .refresh whenever it changes? And it can change in .addItem(), .addListItem(), .clear(), .removeitem(), .removelistitem() and .requery() - and put your enabled= line in the .refresh().

Um... a parent class which would be smart enough to do that even if any of these methods are overridden anywhere down the hierarchy tree? Tough.