Click on toolbar with unfocused form loses click

[GoogleCodeExporter]

If the tabbed image viewer is unfocused and you click directly on one of
the toolbar icons, it returns focus to the image viewer *but* the toolbar
button does not get the click event.

You have to click again.

The button is not receiving the event - so we aren't dropping it. Pretty
sure we didn't see this beahviour before, so its something we've done.
We've tried removing the WndProc stuff and that makes no difference, so
that isn't the culprit.

Original issue reported on code.google.com by fuzzyman on 19 Feb 2007 at 10:23