@classmethod
def unregister(cls, entry, cls_):
    """ Method to remove the blok from a type of declaration

        :param entry: declaration entry of the model where the ``cls_``
            must be removed
        :param ``cls_``: The ``class`` object to remove from the
            Declaration
        :rtype: ``cls_``
        """
    declaration = cls.declaration_types[entry.__declaration_type__]
    declaration.unregister(entry, cls_)
    return cls_
