JavaFX MenuItem add keyboard accelerators

import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.Menu;
import javafx.scene.control.MenuBar;
import javafx.scene.control.MenuItem;
import javafx.scene.control.SeparatorMenuItem;
import javafx.scene.input.KeyCombination;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

public class Main extends Application {
  private Label response;

  public static void main(String[] args) {
    launch(args);//from   w w w . ja  va 2s .  co  m
  }
  public void start(Stage myStage) {    myStage.setTitle("Menus from java2s.com");

    // Use a BorderPane for the root node.
    BorderPane rootNode = new BorderPane();

    Scene myScene = new Scene(rootNode, 300, 300);

    myStage.setScene(myScene);

    response = new Label("Menu Demo");

    // Create the menu bar.
    MenuBar mb = new MenuBar();

    // Create the File menu.
    Menu fileMenu = new Menu("File");
    MenuItem open = new MenuItem("Open");
    MenuItem close = new MenuItem("Close");
    MenuItem save = new MenuItem("Save");
    MenuItem exit = new MenuItem("Exit");
    fileMenu.getItems().addAll(open, close, save, new SeparatorMenuItem(), exit);

    // Add File menu to the menu bar.
    mb.getMenus().add(fileMenu);

    // Create the Options menu.
    Menu optionsMenu = new Menu("Options");

    // Create the Colors sub menu.
    Menu colorsMenu = new Menu("Colors");
    MenuItem red = new MenuItem("Red");
    MenuItem green = new MenuItem("Green");
    MenuItem blue = new MenuItem("Blue");
    colorsMenu.getItems().addAll(red, green, blue);
    optionsMenu.getItems().add(colorsMenu);

    // Create the Priority sub menu.
    Menu priorityMenu = new Menu("Priority");
    MenuItem high = new MenuItem("High");
    MenuItem low = new MenuItem("Low");
    priorityMenu.getItems().addAll(high, low);
    optionsMenu.getItems().add(priorityMenu);

    // Add a separator.
    optionsMenu.getItems().add(new SeparatorMenuItem());

    // Create the Reset menu item.
    MenuItem reset = new MenuItem("Reset");
    optionsMenu.getItems().add(reset);

    // Add Options menu to the menu bar.
    mb.getMenus().add(optionsMenu);

    // Create the Help menu.
    Menu helpMenu = new Menu("Help");
    MenuItem about = new MenuItem("About");
    helpMenu.getItems().add(about);

    // Add Help menu to the menu bar.
    mb.getMenus().add(helpMenu);

    open.setAccelerator(KeyCombination.keyCombination("shortcut+O")); 
    close.setAccelerator(KeyCombination.keyCombination("shortcut+C")); 
    save.setAccelerator(KeyCombination.keyCombination("shortcut+S")); 
    exit.setAccelerator(KeyCombination.keyCombination("shortcut+E"));
    

    // the response label to the center position.
    rootNode.setTop(mb);
    rootNode.setCenter(response);

    myStage.show();
  }
}