protected MenuManager createMenuManager() {
        MenuManager menuBar = new MenuManager("");

        MenuManager fileMenu = new MenuManager("&File");
        MenuManager helpMenu = new MenuManager("&Help");

        menuBar.add(fileMenu);
        menuBar.add(helpMenu);

        fileMenu.add(new OpenAction(MainFrame.this));
        fileMenu.add(new ExitAction(MainFrame.this));
        helpMenu.add(new AboutAction(MainFrame.this));

        return menuBar;
    }