Closed Issue with dialog buttons ignoring clicks on edges

It looks like the region for the button reacting to mouse-over events is different than region for mouse-down events.
If I click in the very upper-left pixel, 100% of the time the button reacts as if it was clicked, but it's functionality doesn't fire.
The button also reverts to it's default state (opposed to "over" state), even though the cursor hasn't moved.