def register_window(self, win):
        if win not in self.wins:
            self.wins.append(win)
        self.update()
Dynamically remove a subform. Raises KeyError.
dataset/ETHPy150Open kivy/kivy/kivy/modules/__init__.py/ModuleBase.register_window--crossover with--dataset/ETHPy150Open cloudera/hue/desktop/core/src/desktop/lib/django_forms.py/MultiForm.remove_subform