Nimbus L&F : Menu stays open when continously clicked on internal frame icon on Windows & nimbus L&F

I have a frame which is having a internal frame. When i click on the icon of the internal frame Menu is displayed. When i continously click on the icon. I would expect the menu to close & open . But right now its not happening on windows & nimbus LookAndFeel. but in GTKLookAndFeel the menu opens & closes for every click. As nimbus LookAndFeel is a cross platform lookAndFeel i would expect the behaviour to be same.

Step to reproduce:-
---------------------
1) Run the attached testcases.
2) Click on the icon of the internal frame continously . If you menu stays as it is with out closing & opening, then the bug is reproduced.

This is reproduced in all the nimbus build.