For the concrete model, check ``get_content_model()``
        for a subclass and redirect to its admin change view.

def change_view(self, request, object_id, **kwargs):
        """
        For the concrete model, check ``get_content_model()``
        for a subclass and redirect to its admin change view.
        """
        instance = get_object_or_404(self.concrete_model, pk=object_id)
        content_model = instance.get_content_model()

        self.check_permission(request, content_model, "change")

        if content_model.__class__ != self.model:
            change_url = admin_url(content_model.__class__, "change",
                                   content_model.id)
            return HttpResponseRedirect(change_url)

        return super(ContentTypedAdmin, self).change_view(
            request, object_id, **kwargs)