JavaFX 2.0: RadioMenuItem and ToggleGroup

package javafx_exmenu;

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

/**
*
* @web http://java-buddy.blogspot.com/
*/
public class JavaFX_exMenu extends Application {

   /**
    * @param args the command line arguments
    */
   public static void main(String[] args) {
       launch(args);
   }
  
   @Override
   public void start(Stage primaryStage) {
       primaryStage.setTitle("java-buddy.blogspot.com");
       Group root = new Group();
       Scene scene = new Scene(root, 400, 300, Color.WHITE);
      
       //Top Menu Bar
       MenuBar menuBar = new MenuBar();

       //Radio Menu
       Menu radioMenu = new Menu("Radio Menu");
      
       radioMenu.getItems().add(
               RadioMenuItemBuilder.create()
               .text("Radio Items 1")
               .build());
       radioMenu.getItems().add(
               RadioMenuItemBuilder.create()
               .text("Radio Items 2")
               .selected(true)
               .build());
      
       //Toggle Group Menu
       Menu toggleMenu = new Menu("Toggle Menu");
       ToggleGroup toggleGroup = new ToggleGroup();
       RadioMenuItem radioItemA = new RadioMenuItem("Option A");
       RadioMenuItem radioItemB = new RadioMenuItem("Option B");
       RadioMenuItem radioItemC = new RadioMenuItem("Option C");
       radioItemA.setToggleGroup(toggleGroup);
       radioItemB.setToggleGroup(toggleGroup);
       radioItemC.setToggleGroup(toggleGroup);
       toggleMenu.getItems().add(radioItemA);
       toggleMenu.getItems().add(radioItemB);
       toggleMenu.getItems().add(radioItemC);
      
       menuBar.getMenus().add(radioMenu);    //Add Radio Menu
       menuBar.getMenus().add(toggleMenu);   //Add Toggle Group Menu
      
       menuBar.prefWidthProperty().bind(primaryStage.widthProperty());
       root.getChildren().add(menuBar);
       primaryStage.setScene(scene);
       primaryStage.show();
   }
}