JPanel with many children doesn't display them all in a narrow window

Question

I'm writing an application that has a JPanel at the top containing many
JToolBars. However, the height of the JPanel stays constant when I narrow
the application window so that many of the JToolBars are not displayed.
I would like to have the JPanel increase in height as the window narrows
so that all the JToolBars remain visible. How can you do this? Thanks.
Try widening/narrowing the window in this example:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Sample extends JFrame {
    public Sample(String name) {
        super(name);
        JPanel tp = new JPanel(new FlowLayout());
        for (int i = 0; i < 10; i++) {
            JToolBar tb = new JToolBar("toolbar" + i);
            for (int j = 0; j < 10; j++) {
                tb.add(new AbstractAction(("Action" + i) + j) {
                    public void actionPerformed(ActionEvent event) {
            tp.add(tb);
        JPanel cp = new JPanel();
        cp.setSize(400, 400);
        cp.setBackground(Color.red);
        add(tp, BorderLayout.PAGE_START);
        add(cp, BorderLayout.CENTER);
    public static void main(String[] args) {
        Sample s = new Sample("Sample");
        s.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        s.setSize(500, 500);
        s.setVisible(true);
}

Answer 1

There are some neat tricks in this thread.
http://forum.java.sun.com/thread.jspa?threadID=716580&messageID=4190052