'Register the attributes.'

@classmethod
def get_attributes(cls):

    return [Attribute('params', None), Attribute('html_file', None), Attribute('gradefn', 'gradefn'), Attribute('get_statefn', None), Attribute('initial_state', None), Attribute('set_statefn', None), Attribute('width', '400'), Attribute('height', '300'), Attribute('title', 'Problem    Remote    Content'), Attribute('sop', None)]
