'Bind to all widgets at an event SEQUENCE a call to function FUNC.
An additional boolean parameter ADD specifies whether FUNC will
be called additionally to the other bound function or whether
it will replace the previous function. See bind for the return value.'

def bind_all(self, sequence=None, func=None, add=None):

    return self._bind(('bind', 'all'), sequence, func, add, 0)
