protected function getDefaultButtonList($config)
    {
        $new = ($this->owner->ID == 0);
        $list = $new
            ? Config::inst()->get($config, $this->checkVersioned() ? "versioned_create" : "create")
            : Config::inst()->get($config, $this->checkVersioned() ? "versioned_edit" : "edit");

        return $list ?: array ();
    }