[vtkusers] GetEventObject() returns different objects on different platforms

[Klaus Nowikow]

Hi,

I was just hit by [ 688381 ]:
https://sourceforge.net/tracker/?func=detail&atid=109863&aid=688381&group_id=9863

Event.GetEventObject() for command events (EVT_MENU) returns the
frame object on Windows, but the menu object on Linux.

Is there a workaround for this? I'd really like to avoid having
to use different code for Windows and Linux, because such code
gets unmaintainable very fast.

--
Klaus