How to get reference for JFrame

Hello,
I want to ask for an example. I want to run JDialog from JMenuItem. I
have JFrame in one file and JDialog in another. As far as I know I must
pass frame-parent as argument to JDialog. Examples which I found were
similar to:

JFrame frame = new JFrame();
JDialog dialog = new JDialog(frame (...)

Code is in one class, so there is no problem. I don't know how to pass
argument in this:

Main.java:
(...)
public static void main(String[] args) {
    Main ste = new Main();
    ste.setVisible(true); }

public Main() {
    super();
    initialize(); }

private void initialize() {
    this.setSize(700, 500);
    this.setJMenuBar(pasekMenu());
    this.setContentPane(oknoGlowne()); }
(...)
private JMenuItem getHelp() {
    if (HelpAbout == null) {
        HelpAbout = new JMenuItem();
        HelpAbout.setText("About");

        HelpAbout.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                    ???
                }});
        }
        return HelpAbout; }
(...)

JDabout.java:

public JDabout(Frame owner) {
    super(owner);
    initialize();
}

Is there any method to get jFrame parent? Also, is this code correct:
JDabout about = new JDabout(?);
--
Best regards, Matthew
[ e-mail: matp dot sa a-t gmail dot com ]
[ JID 1: coolmax@jabberpl.org ]
[ 2: / same as e-mail / ]