Peter,
Couldn't you use the Selected property? Perhaps in conjunction with InteractiveChange()?

I saw an article about a year ago on making your lists more aware - it involved keeping an array with an entry for each item in the list. Time consuming, though.

>I need to determine when the selection changes in a multi select listbox. There doesn't seem to be anything like an OnSelectionChanged event.
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>TIA
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>Peter