public   class  Installer  extends  ModuleInstall  implements  Runnable {
    
     public   void  restored() {
        EventQueue.invokeLater ( this );  
    }
    
     public   void  run() {
         try  {                        
            JFrame ff = (JFrame) WindowManager.getDefault().getMainWindow();
                JMenuBar mm = ff.getJMenuBar();
                 if  (mm== null ) {
                    EventQueue.invokeLater ( this );
                }  else  {
                    mm.add( new  JMenu("Test2")); 
                    ff.setExtendedState(JFrame.MAXIMIZED_BOTH);
                    JOptionPane.showMessageDialog( null ,"Ok");
                }
            
        }  catch  (Exception ex) {
            ex.printStackTrace();
        }        
    }
    
}