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 _setup_item_button(self, item_button, icon, position=None):
    item_button.set_relief(gtk.RELIEF_NONE)