Making panel stands out on frame.

Hi!

I am trying to place panel that contains four buttons that stands out on JFrame. It is better to see the sample applet.

http://webdev.apl.jhu.edu/~rbe/java/Homework5/index.html

****************************************
public class HW5
    extends JApplet
    implements ActionListener {
...
...
...
  public void init() {
    wizardFrame = new JFrame("Configure Plotpad");
    layout = new GridBagLayout();
    container = wizardFrame.getContentPane();
...
...

    JPanel btnPanel = new JPanel();

    btnPanel.add(controls[0]);
    btnPanel.add(controls[1]);
    btnPanel.add(controls[2]);
    btnPanel.add(controls[3]);
    container.add(btnPanel, BorderLayout.SOUTH);
...
...
*************************************
I know it does stands out on JPanel, but how do I do on JFrame?

thanks,