>>I'm not sure I want to move the code into LostFocus. I also found that _incseek setting has no effect on the behavior (as I suspected). I'm not sure if there is a solution for the problem, I'm afraid - there is not.
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>You may try CHRSAW() or KeyPress to see if there're keystrokes pending

CHRSAW doesn't seem to work and I'm not sure what can I do in KeyPress. The only solution I found so far (but it's ugly) is to return 1 in my do case. In other words, as long as I fire a message I move focus out of the combobox.