JDIalog, HTML Code, setLocationRelativeTo; not centered

Hi,
I am building my own modal dialog; it's a JLabel with formatted HTML Code - I only use the bold <b> and break <br> tag in the default font size and -type.
I use setLocationRelativeTo() to center the dialog to my main JFrame; however, the dialog is not centered, it's shifted down to the right. Even if I just use some letters in my HTML code the dialog isn't centered. Here is my code:
public class TDDialog extends JDialog implements ActionListener, WindowListener {
     private JPanel exercisePanel, containerPanel;
     private JLabel exerciseLabel;
     private JButton readyButton = new JButton("Ready");
     private JButton showSolutionButton = new JButton("Solution");
     private JTextField solutionTextfield;
     private String solutionString;
     private Font font = new Font("SansSerif", Font.PLAIN, 12);
     public TDDialog(Frame ownerFrame) {
          super(ownerFrame, true);
          addWindowListener(this);
          setTitle("Exercise");
          setLayout(new BorderLayout());
          exerciseLabel = new JLabel();
          exerciseLabel.setFont(font);
          exercisePanel = new JPanel();
          exercisePanel.add(exerciseLabel);
          solutionTextfield = new JTextField();
          solutionTextfield.addActionListener(this);
          containerPanel = new JPanel();
          containerPanel.setLayout(new BorderLayout());
          containerPanel.add(readyButton, BorderLayout.LINE_START);
          containerPanel.add(showSolutionButton, BorderLayout.CENTER);
          readyButton.setFont(font);
          showSolutionButton.setFont(font);
          readyButton.addActionListener(this);
          showSolutionButton.addActionListener(this);
          exerciseLabel.setText("<html><body>3 Lines<br><b>3 Lines</b><br>3 Lines<br></body></html>");
          add(exercisePanel, BorderLayout.PAGE_START);
          add(solutionTextfield, BorderLayout.CENTER);
          add(containerPanel, BorderLayout.PAGE_END);
          setResizable(false);
          pack();
          setLocationRelativeTo(ownerFrame);
          setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
// action- and window-listeners...Am I building the JDialog correctly? Is there a better, a more recommended or "nicer" way? Why isn't hte dialog centered?
Edit: I really would like to assign Duke Stars to my question, however, since the last forum maintenance, I can't do this any more "Server Error
This server has encountered an internal error which prevents it from fulfilling your request. The most likely cause is a misconfiguration. Please ask the administrator to look for messages in the server's error log." This happens every time at different PCs with different browsers / versions / proxy-settings.
Message was edited by:
SFL

Here is the missing part for a SSCCE; I noticed that the modal dialog is centered in relation to the screen, not to the "ownerFrame", although I pass ownerFrame to the setRelativeTo statement.
import java.awt.Dimension;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class GUI_Test extends JComponent implements MouseListener {
     private static final long serialVersionUID = 1L;
     private JPanel pmPanel = new JPanel();
     private TDDialog tdd = new TDDialog(GUI_Test.frame);
     private static JFrame frame;
     public GUI_Test() {
          addMouseListener(this);
          add(pmPanel);
     private static void createAndShowGUI() {
          JFrame.setDefaultLookAndFeelDecorated(true);
          frame = new JFrame();
          frame.setTitle("GUI_Test");
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          GUI_Test newContentPane = new GUI_Test();
          newContentPane.setOpaque(true);
          frame.setPreferredSize(new Dimension(500, 500));
          frame.setResizable(false);
          frame.setContentPane(newContentPane);
          frame.pack();
          frame.setVisible(true);
     public static void main(String[] args) {
          javax.swing.SwingUtilities.invokeLater(new Runnable() {
               public void run() {
                    createAndShowGUI();
     public void mouseClicked(MouseEvent arg0) {
          tdd.setVisible(true);
     public void mouseEntered(MouseEvent arg0) {}
     public void mouseExited(MouseEvent arg0) {}
     public void mousePressed(MouseEvent arg0) {}
     public void mouseReleased(MouseEvent arg0) {}
}Thanks for your help!

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