Problemas com FrameView (botão X Sair)

public class DesktopApplication1 extends SingleFrameApplication {
 
    /**
     * At startup create and show the main frame of the application.
     */
    @Override protected void startup() {
        show(new DesktopApplication1View(this));
    }
 
    @Override protected void configureWindow(java.awt.Window root) {
    }
 
    public static DesktopApplication1 getApplication() {
        return Application.getInstance(DesktopApplication1.class);
    }
 
    /**
     * Main method launching the application.
     */
    public static void main(String[] args) {
        launch(DesktopApplication1.class, args);
    }
}

public class DesktopApplication1View extends FrameView {
    
    public DesktopApplication1View(SingleFrameApplication app) {
        super(app);
        initComponents();
        ...
        ...
    }
    ...   
   /* haves buttoms label textboxes*/
   /*do something*/
    ...
}

this.getFrame().setDefaultCloseOperation(JFrames.DO_NOTHING_ON_CLOSE);

@Override
public void exit(EventObject event) {
}

@Override
public void end() {
}