In Windows:
When focus is transferred from choice to some other component, choice triggers mouse events when mouse is not at all near the choice and no mouse operation is performed. This is noticed in merlin-beta.

How to reproduce the Bug? -------->
Run this sample code. You would see a frame with a choice at the center,a button and a textfield. Transfer the focus from choice to to either button or textfield by clicking them or by pressing the TAB key. If you notice any of the mouse events being triggered for choice then the bug is reproduced.