If we're adding, save must be "save and continue editing"

        Two exceptions to that workflow:
        * The user has pressed the 'Save and add another' button
        * We are adding a user in a popup

def response_add(self, request, obj, post_url_continue=POST_URL_CONTINUE):
        """If we're adding, save must be "save and continue editing"

        Two exceptions to that workflow:
        * The user has pressed the 'Save and add another' button
        * We are adding a user in a popup

        """
        if '_addanother' not in request.POST and '_popup' not in request.POST:
            request.POST['_continue'] = 1
        return super(ExportAdmin, self).response_add(request,
                                                     obj,
                                                     post_url_continue)