def add_subform(self, name, form_cls, data=None):
    self._form_types[name] = form_cls
    self._bind_one(name, form_cls, data)
rowCountSpinBox() -> SizeSpinBox
dataset/ETHPy150Open cloudera/hue/desktop/core/src/desktop/lib/django_forms.py/MultiForm.add_subform--crossover with--dataset/ETHPy150Open VisTrails/VisTrails/vistrails/packages/spreadsheet/spreadsheet_tab.py/StandardWidgetToolBar.rowCountSpinBox