How to prevent a JPanel to grow ?

Hello,
I've included a JPanel in a JScrollPane.
When I size down the whole thing, scroll bars appear. Nice.
But when I size up, the JPanel grows and its content (buttons) is stretched.
I would like the JPanel to always keep the same size, and some grey area to appear around it when the JScrollPane is sized up. I've tried with :
panel.setMaximumSize (panel.getPreferredSize ());
panel.setMinimumSize (panel.getPreferredSize ());
But it does nothing...
Do you know how to do ?
Matthieu

Subclass the JPanel and return your own fixed preferredSize always.

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package filechooser;
import java.awt.BorderLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
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import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
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