>>My app has a logging function. I put some log code in the MouseDown event and it never gets executed through the entire sequence. I did the same on the other events; they execute, but don't return any useful value. I have not yet tried MouseUp. I'm not optimistic, but it's worth a try I guess.
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>I didn't mean your own logging (though it should at least show that code was run - and nMouse should have a value), I meant SET EVENTTRACKING to a file and then looking at what happens and in what sequence. I've often found that things there don't happen in an order I would expect. It's a magnifying glass... though if something isn't there, it won't find it.

Just an FYI, Dragan: your surmise on MouseUp turns out to be correct; the MouseUp nButton parameter does return 1 for left click and 2 for right click in my scenario. I had come up with a work-around before I discovered this, so it's sort of a moot point now, but good to know for future reference. [Added later] And I just discovered that MouseUp fires AFTER GotFocus, so it does no good in my scenario in any case. Rats.