def add_field(self, name = None, values = None, field_type = None,
            label = None, options = None, required = False, desc = None, value = None):
        field = Field(name, values, field_type, label, options, required, desc, value)
        self.fields.append(field)
        return field
Called when the update button is clicked. Needs to update the
dataset/ETHPy150Open kuri65536/python-for-android/python3-alpha/python-libs/pyxmpp2/ext/dataforms.py/Form.add_field--crossover with--dataset/ETHPy150Open kivy/kivy/examples/demo/kivycatalog/main.py/Catalog.change_kv