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 draw_path(self,c,container):
		c.path(self.center[0],self.center[1],container.center[0],container.center[1])