public function getThemeCustomizableStyleList()
    {
        if (!isset($this->styleList)) {
            $env = Environment::get();
            $r = $env->getRecord(
                DIRNAME_THEMES.'/'.$this->getThemeHandle(
                ).'/'.DIRNAME_CSS.'/'.FILENAME_STYLE_CUSTOMIZER_STYLES,
                $this->getPackageHandle()
            );
            $this->styleList = \Concrete\Core\StyleCustomizer\StyleList::loadFromXMLFile($r->file);
        }

        return $this->styleList;
    }