如何在CardLayout中显示LayeredPane

Question

我在Card Layout中的开关面板有问题。我创建卡布局，然后向其中添加一些面板。当我尝试从jLabel2切换面板文本时，没有出现，但我认为该面板已更改。

panelGlowny = new javax.swing.JLayeredPane();
losowaniePanel = new javax.swing.JPanel();
jLabel2 = new javax.swing.JLabel();
test = new javax.swing.JButton();
.....
panelGlowny.setLayout(new java.awt.CardLayout());
jLabel2.setText("Losowanie Panel");
javax.swing.GroupLayout losowaniePanelLayout = new javax.swing.GroupLayout(losowaniePanel);
        losowaniePanel.setLayout(losowaniePanelLayout);
        losowaniePanelLayout.setHorizontalGroup(
            losowaniePanelLayout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(losowaniePanelLayout.createSequentialGroup()
                .addGap(162, 162, 162)
                .addComponent(jLabel2)
                .addContainerGap(160, Short.MAX_VALUE))
        );
panelGlowny.add(losowaniePanel, "card2");

test.setText("test");
        test.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                testActionPerformed(evt);
            }
        });

.....
 private void testActionPerformed(java.awt.event.ActionEvent evt) {                                          
        losowanie_panel();
    }   
.....

public void losowanie_panel()
    {
        panelGlowny.removeAll();
        panelGlowny.add(losowaniePanel);
        invalidate();
        repaint();
    }