protected function getPrefixedThemeId($themeId) {
        if($themeId === 'tao') {
            return $themeId;
        }
        if(preg_match('~^' . $this->extensionId . '[A-Z]~', $themeId)) {
            return $themeId;
        }
        return $this->extensionId . ucfirst($themeId);
    }