protected function addEventListener()
    {
        Event::subscribe(ExtendMenuHandler::class);
        //Brand events
        Event::subscribe(BrandModelHandler::class);
        //Category events
        Event::subscribe(CategoryModelHandler::class);
        //Currency events
        Event::subscribe(CurrencyModelHandler::class);
        //Offer events
        Event::subscribe(OfferModelHandler::class);
        //Price events
        Event::subscribe(PriceModelHandler::class);
        //Product events
        Event::subscribe(ProductModelHandler::class);
        Event::subscribe(ProductRelationHandler::class);
        //Promo block events
        Event::subscribe(PromoBlockModelHandler::class);
        Event::subscribe(PromoBlockRelationHandler::class);
        //Tax events
        Event::subscribe(TaxModelHandler::class);
        Event::subscribe(TaxRelationHandler::class);
        Event::subscribe(ExtendTaxFieldsHandler::class);
    }