[python-win32] Trouble With Events in Inventor

[Roger Upole]

If you're running the script from python.exe, you'll need to run
a message loop (pythoncom.PumpMessages()) to receive events.
You don't need that in Pythonwin since it runs its own message loop.

Also, are you sure the event class should be attached to the button
itself ?  I'm not familiar with this application, but normally the top
level COM object receives the events.

   Roger