JDialog gain focus and flash

Hi, I have a custom about dialog and want to code it so that the title bar
flashes when it has lost focus - just like normal windows about dialog
behaviour.

This is what I have which works ok although the title bar does not flash.    

 private void mnuHelpAboutActionPerformed(java.awt.event.ActionEvent evt) {
        AboutDialog.pack();
        AboutDialog.setLocationRelativeTo(this);
        AboutDialog.setVisible(true);
    }

    private void AboutDialogWindowLostFocus(java.awt.event.WindowEvent evt)
{
        AboutDialog.toFront();
    }

the AboutDialog.alwaysOnTop property is set to true

Am I going about this the wrong way?
I am relatively new to netbeans and java and any help would be appreciated

Thanks

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