public PanelBatohu(Inventar inventar) {
        super();
        if ( inventar != null ){
            this.inventar = inventar;
            this.inventar.zaregistrujPozorovatele(this);
            this.aktualizuj(inventar);
            this.setBorder(BorderFactory.createTitledBorder("Váš inventář"));
            this.setVisible(true);
        }

    }