GUI is not dispose/hide on my ActionListener

Question

Hi all,
I have add a JEditorPane, a JLable, a JButton on a JPanel. Then I add that JPanel to a JDialog to avoid displaying the title bar on the system-tray. On a cation event I want to hide whole of them. Not to exit the system.
Here are the component declarations I used. It may help for your answer.
    private JPanel mainPanel = new JPanel();
    private JLabel mainLabel = new JLabel();
    public JButton mainButton = new JButton();
    private JEditorPane editor = new JEditorPane();
    private JDialog dialog = new JDialog();Add the action listener to the button and all properties as follows.
        editor.setEditorKit(new HTMLEditorKit());
        editor.setContentType("text/html");
        editor.setEditable(false);
        editor.addHyperlinkListener(this);
        editor.setBorder(new BevelBorder(BevelBorder.LOWERED));
        mainLabel.setText("HTML_Text");
        mainLabel.setSize(new Dimension(40, 20));
        mainLabel.setLocation(200, 200);
        mainPanel.add(mainLabel);
        mainButton.setText("Exit");
        mainButton.setSize(new Dimension(65, 25));
        mainButton.setLocation(200, 250);
        mainPanel.add(mainButton);     
// Add an ActionListner to the mainButton
        mainButton.addActionListener(new AbstractAction() {
            public void actionPerformed(ActionEvent e) {
                if("Exit".equals(e.getActionCommand())){  // Newly added code segment
        mainPanel.setLayout(new BorderLayout());
        mainPanel.setPreferredSize(new Dimension(300, 300));
        mainPanel.add(editor); Then I try follows.
                    dialog.dispose();
                    dialog.setVisible(false);Nothing happened at all.
mainPanel.setVisible(false);All the controls are vanished. But there is a gray color background is there. It's not dispose or any.
mainPanel.setVisible(false);This remains the label and the button with the above gray color background.
Can you guys tell me where I'm going wrong.
thanks.

Answer 1

you need to post some code that we can copy/paste/compile/run and see the problem in front of us.
just enough code to produce the problem, 20-50 lines normally, not a 1000 line program