private function createAdditionalThumbnail($fileName, $fileExtension, $product_id)
 {
     return \ImageUploader::createThumbnail(WWW_DIR . "/images/" . "module" . $this->moduleName . "/" . $this->module->id . "/" . $product_id . "/" . $fileName . $fileExtension, WWW_DIR . "/images/" . "module" . $this->moduleName . "/" . $this->module->id . "/" . $product_id . "/" . $fileName . "_th" . $fileExtension, 400, NULL);
 }