protected function add_plugin_grade_elements($grade, MoodleQuickForm $mform, stdClass $data, $userid) {
        foreach ($this->feedbackplugins as $plugin) {
            if ($plugin->is_enabled() && $plugin->is_visible()) {
                $plugin->get_form_elements_for_user($grade, $mform, $data, $userid);
            }
        }
    }