'Make the figure corresponding to *manager* the active one.'

@classmethod
def set_active(cls, manager):

    oldQue = cls._activeQue[:]
    cls._activeQue = []
    for m in oldQue:
        if (m != manager):
            cls._activeQue.append(m)
    cls._activeQue.append(manager)
    cls.figs[manager.num] = manager
