JDialog: Repaint does not work as wanted when called a second time

Hi,
I have created a JDialog with a More/Less Details button which, when invoked, shows or not shows a JScrollPane with a JEditorPane and resizes the dialog window to make space for that extra component or to take away that space.
It works fine the first time I invoke the JDialog (see main method). But if I invoke it a second time and want to see the details the details JScrollPane is not fully shown.
I have experimented with repaint and revalidate on different panels but to no avail.
I am quite new to Swing, what am I misunderstanding? Is my Close-button not tidying up properly?
import javax.swing.*;
import javax.swing.border.*;
import java.awt.event.*;
import javax.swing.event.*;
import java.awt.*;
class Tester extends JDialog {
 private static int totalWidth = 200;
 private static int totalHeight = 100;
 private static int detailsPanelHeight = 200;
 public Tester() {
 super();
 public static int createAndShowGUI() {
 Tester td = new Tester();
 return td.doGUI();
 public int doGUI() {
 //Create and set up the window.
 setPreferredSize(new Dimension(totalWidth, totalHeight+detailsPanelHeight));
 setModal(true);
 setResizable(false);
 setTitle("Tester");
 setAlwaysOnTop(true);
 final Container mainPane = getContentPane();
 mainPane.setLayout(new FlowLayout());
 // *** Panel for details
 final JEditorPane detailsText = new JEditorPane("text/html", "<HTML>Some html.</HTML>");
 final JScrollPane detailsPanel = new JScrollPane(detailsText);
 detailsPanel.setBorder(new TitledBorder("Details"));
 detailsText.setEditable(false);
 detailsPanel.setPreferredSize(new Dimension(totalWidth-100, detailsPanelHeight));
 detailsPanel.setVisible(false);
 // *** Panel for Info
 final JToggleButton detailsBtn = new JToggleButton("More Details");
 detailsBtn.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 if (detailsBtn.isSelected()) {
 detailsBtn.setText("Less Details");
 detailsBtn.repaint();
 detailsPanel.setVisible(true);
 setBounds(getX(), getY(),
 getWidth(), getHeight()+detailsPanelHeight);
 // Also tried detailsPanel.revalidate(), mainPane.revalidate/repaint()
 // to no avail
 detailsPanel.repaint();
 else {
 detailsBtn.setText("More Details");
 detailsBtn.repaint();
 detailsPanel.setVisible(false);
 setBounds(getX(), getY(),
 getWidth(), getHeight()-detailsPanelHeight);
 detailsPanel.repaint();
 // *** Panel for buttons
 JPanel btnPanel = new JPanel();
 mainPane.add(btnPanel);
 mainPane.add(detailsPanel);
 // Allow Button
 JButton allowBtn = new JButton("Close");
 allowBtn.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 setVisible(false);
 dispose();
 btnPanel.add(allowBtn);
 btnPanel.add(detailsBtn);
 //Display the window.
 pack();
 setBounds(getX(), getY(), totalWidth, totalHeight);
 setVisible(true);
 return 1;
 public static void main(String[] args) {
 javax.swing.SwingUtilities.invokeLater(new Runnable() {
 public void run() {
 // Run once and you can see details in nice window
 System.err.println(Tester.createAndShowGUI());
 // Run twice and switching on details shows an empty space
 System.err.println(Tester.createAndShowGUI());
}

Replace your action preformed with this:
public void actionPerformed(ActionEvent e) {
    if (detailsBtn.isSelected()) {
     detailsBtn.setText("Less Details");
     setSize(new Dimension(
            getWidth(), getHeight()+detailsPanelHeight));
     detailsPanel.setVisible(true);
    else {
     detailsBtn.setText("More Details");
     detailsPanel.setVisible(false);
     setSize(new Dimension(
                 getWidth(), getHeight()-detailsPanelHeight));
    validate();
}

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