JApplet에서 modal JDialog 띄우기

public class TestApplet extends JApplet implements ActionListener{
	public void init(){
		JButton btn = new JButton("click me!");
		btn.addActionListener(this);
		add(btn);
	}
	public void actionPerformed(ActionEvent e){
		new AboutDialog(this);
	}
}

public class AboutDialog extends JDialog{
	public AboutDialog(JApplet parent) {
		super(JOptionPane.getFrameForComponent(parent), true);
		setTitle("About DodgeSnow TEST");
		initComponents();
		setVisible(true);
	}
	private void initComponents(){
		add(new JLabel("TEST"));
		pack();
	}
}