ComboBox drop-down window closing/hidden

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I am trying to get an event when the drop-down Combo Box goes away /
reverts back to showing a single item.

For example, clicking the box's down arrow, to remove the drop-down
window, doesn't seem to generate any event. Not even a mouse event.
That seems a little odd.

Besides not finding a public event method, I can't seem to find a
protected method to over-ride either.

I am guessing I need to look for a message in ComboBox's WndProc().
But I don't know which message is the one I'm looking for.

Any ideas ?

Thanks...


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