def __init__(self, groups=None):
        super(GroupedRequirements, self).__init__(NamedRequirements)
        self.groups = groups or self.default_groups
        self.filename = None
        self.create_default_groups()
def _on_event_box_buttons_size_allocate(self, event_box, allocation):
    if self._buttons_allocation is not None:
      return