def __init__(self, fields, envelope=None):
        self.fields = fields
        self.envelope = envelope
Set the enabled state of the underlying control.
dataset/ETHPy150Open flask-restful/flask-restful/flask_restful/__init__.py/marshal_with.__init__--crossover with--dataset/ETHPy150Open nucleic/enaml/enaml/qt/qt_action_group.py/QtActionGroup.set_enabled