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Printing a JPanel

Hello,

I am trying to figure out how to print a JPanel using java.awt.print
framework. I want to print out a JPanel as it appears on the screen.
As a test I wrote a small program that brings up a print dialog when
the button is clicked. When it is printed, only a black square the
same size as my component is printed, and none of the contents are
printed. I am clearly missing something. If someone can point me in
the right direction that would be great. I have not found the online
printing tutorial at Sun all that helpful for what I want to do.

Thanks,
Jonathan
// here is my test program
import java.awt.*;
import java.awt.print.*;
import javax.swing.*;
import java.awt.event.*;

public class PrintButton extends JPanel implements
Printable, ActionListener{
JButton ok = new JButton("OK");

public PrintButton(){
ok.addActionListener(this);
this.setPreferredSize(new Dimension(400,400));
this.add(ok);
JFrame frame = new JFrame("Print");
frame.getContentPane().add(this);
frame.pack();
frame.setVisible(true);
}


public static void main(String[] args) {
new PrintButton();
}


public void actionPerformed(ActionEvent e) {


PrinterJob printJob = PrinterJob.getPrinterJob();
printJob.setPrintable(this);
if (printJob.printDialog()){
try{
printJob.print();
}
catch(Exception ex){
throw new RuntimeException(ex);
}
}
}


public int print(Graphics g, PageFormat pf, int index) throws
PrinterException {

Graphics2D g2 = (Graphics2D)g;
if (index >= 1){
return Printable.NO_SUCH_PAGE;
}
else {

ok.printAll(g2);
return Printable.PAGE_EXISTS;
}

}
}
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