imgLabel.addMouseListener(new MouseAdapter() {
            @Override
            public void mouseReleased(MouseEvent e) {
                if (e.getButton() == MouseEvent.BUTTON3) {
                    JPopupMenu menu = new JPopupMenu();
                    JMenuItem delEvent = new JMenuItem("Smazat obrázek");
                    menu.add(delEvent);
                    menu.show(e.getComponent(), e.getX(), e.getY());
                    /*! \todo: Action listener pro delete. */
                }
            }
         });