private void initComponents() {
    setDefaultCloseOperation(JDialog.DO_NOTHING_ON_CLOSE);

    messagePane.setBackground(contentPane.getBackground());
    messagePane.setEditorKit(new HTMLEditorKit());
    messagePane.setForeground(contentPane.getForeground());

    setSize(450, 360);

    // center the window
    int x = (int) (Toolkit.getDefaultToolkit().getScreenSize().getWidth() - getWidth()) / 2;
    int y = (int) (Toolkit.getDefaultToolkit().getScreenSize().getHeight() - getHeight()) / 2;
    setLocation(x, y);

    okButton.addActionListener(this);
  }