def add_subform(self, name, form_cls, data=None):
    self._form_types[name] = form_cls
    self._bind_one(name, form_cls, data)
Dynamically extend this MultiForm to include a new subform
dataset/ETHPy150Open cloudera/hue/desktop/core/src/desktop/lib/django_forms.py/MultiForm.add_subform