Enforce custom delete permissions for the page instance.

def delete_view(self, request, object_id, **kwargs):
        """
        Enforce custom delete permissions for the page instance.
        """
        page = get_object_or_404(Page, pk=object_id)
        content_model = page.get_content_model()
        self.check_permission(request, content_model, "delete")
        return super(PageAdmin, self).delete_view(request, object_id, **kwargs)