public void actionPerformed(java.awt.event.ActionEvent evt) {
                    Window w = SwingUtilities.getWindowAncestor(op);
                    if (w != null) {
                        w.dispose();
                    }
                    m1=m3;
                    jPanel21.removeAll();
                    m1.vypis(jPanel21);
                    jPanel11.updateUI();
                }