called on menu selection

def menu_callback(self, m):
        '''called on menu selection'''
        if m.returnkey.startswith('# '):
            cmd = m.returnkey[2:]
            if m.handler is not None:
                if m.handler_result is None:
                    return
                cmd += m.handler_result
            self.mpstate.functions.process_stdin(cmd)
        if m.returnkey == 'menuSettings':
            wxsettings.WXSettings(self.settings)