How to use JFrame's setLayeredPane() method?

Question

I want to custom JFrame's LayeredPane by setLayeredPane() method,but it does't work.
Anyone who can help me?
The code as follows:
import javax.swing.*;
import java.awt.*;
public class LayeredTest{
    public static void main(String[] args){
        SwingUtilities.invokeLater(new Runnable(){
            public void run(){
                new MyFrame().setVisible(true);
class MyFrame extends JFrame{
    public MyFrame(){
        super("LayeredTest");
        setLayeredPane(new JLayeredPane());           //this line, I want to set the LayeredPane myself;
                                                      //but it doesn't work.
        JPanel panel =new JPanel();
        panel.setPreferredSize(new Dimension(320,240));
        panel.add(new JLabel("Label"));
        panel.add(new JButton("Button"));
        add(panel);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        pack();   
}

Answer 1

Thanks!
But the very thing I want to know is "How to set Layered Pane(by setLayeredPane() method)",
not "How to use Layered Pane".