def __init__(self, *args, **kwargs):
required = kwargs.pop('required', False)
allowed = kwargs.pop('allowed', False)
Column.__init__(self, *args, **kwargs)
self._required = required
self._allowed = required or allowed
def __init__(self, name, *args, label=None, select_exp=None, **kwargs):
Column.__init__(self, name, *args, **kwargs)
self.label = label if label else name
self.select_exp = select_exp
