[Google Wave APIs] Just can't get FORM_BUTTON_ADDED work (Python)

I just cant get it work, here's my code: Main class: if __name__ == '__main__': myRobot = robot.Robot('APP-NAME', image_url='http://APP-NAME.appspot.com/icon.png', version='1', profile_url='http://APP-NAME.appspot.com/') myRobot.RegisterHandler(events.WAVELET_PARTICIPANTS_CH

[Google Wave APIs] Is it possible to know who added who in a wave?

I'm developing an application that would be nice to know who added who in the wave. By the way, if it is not possible, how can I set user permissions (like add participants, reply, etc) in the wave? (If it's possible, of course) Thanks you in advance, Berna