Edit C:\Program Files\Java\jdk1.8.0_121\javafx\scene\control\MenuBar.java

/*
 * Copyright (c) 2010, 2014, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 *
 *
 */

package javafx.scene.control;

import com.sun.javafx.css.converters.BooleanConverter;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import javafx.beans.DefaultProperty;
import javafx.beans.property.BooleanProperty;
import javafx.beans.value.WritableValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.css.CssMetaData;
import javafx.css.StyleableBooleanProperty;

import com.sun.javafx.scene.control.skin.MenuBarSkin;

import javafx.css.Styleable;
import javafx.css.StyleableProperty;
import javafx.scene.AccessibleRole;

/**
 * <p>
 * A MenuBar control traditionally is placed at the very top of the user
 * interface, and embedded within it are {@link Menu Menus}. To add a menu to
 * a menubar, you add it to the {@link #getMenus() menus} ObservableList.
 * By default, for each menu added to the menubar, it will be
 * represented as a button with the Menu {@link MenuItem#textProperty() text} value displayed.
 * <p>
 * MenuBar sets focusTraversable to false.
 * </p>
 *
 * To create and populate a {@code MenuBar}, you may do what is shown below.
 * Please refer to the {@link Menu} API page for more information on how to
 * configure it.
 * <pre><code>
 * final Menu menu1 = new Menu("File");
 * final Menu menu2 = new Menu("Options");
 * final Menu menu3 = new Menu("Help");
 *
 * MenuBar menuBar = new MenuBar();
 * menuBar.getMenus().addAll(menu1, menu2, menu3);
 * </code></pre>
 *
 * @see Menu
 * @see MenuItem
 * @since JavaFX 2.0
 */
@DefaultProperty("menus")
public class MenuBar extends Control {

/***************************************************************************
     *                                                                         *
     * Constructors                                                            *
     *                                                                         *
     **************************************************************************/

/**
     * Creates a new empty MenuBar.
     */
    public MenuBar() {
        this((Menu[])null);
    }

/**
     * Creates a new MenuBar populated with the given menus.
     *
     * @param menus The menus to place inside the MenuBar
     * @since JavaFX 8u40
     */
    public MenuBar(Menu... menus) {
        getStyleClass().setAll(DEFAULT_STYLE_CLASS);
        setAccessibleRole(AccessibleRole.MENU_BAR);

if (menus != null) {
            getMenus().addAll(menus);
        }

// focusTraversable is styleable through css. Calling setFocusTraversable
        // makes it look to css like the user set the value and css will not
        // override. Initializing focusTraversable by calling applyStyle with null
        // StyleOrigin ensures that css will be able to override the value.
        ((StyleableProperty<Boolean>)(WritableValue<Boolean>)focusTraversableProperty()).applyStyle(null, Boolean.FALSE);
    }

/***************************************************************************
     *                                                                         *
     * Instance variables                                                      *
     *                                                                         *
     **************************************************************************/
    private ObservableList<Menu> menus = FXCollections.<Menu>observableArrayList();

/***************************************************************************
     *                                                                         *
     * Properties                                                              *
     *                                                                         *
     **************************************************************************/

/**
     * Use the system menu bar if the current platform supports it.
     *
     * This should not be set on more than one MenuBar instance per
     * Stage. If this property is set to true on more than one
     * MenuBar in the same Stage, then the behavior is undefined.
     *
     * @since JavaFX 2.1
     */
    public final BooleanProperty useSystemMenuBarProperty() {
        if (useSystemMenuBar == null) {
            useSystemMenuBar = new StyleableBooleanProperty() {

@Override
                public CssMetaData<MenuBar,Boolean> getCssMetaData() {
                    return StyleableProperties.USE_SYSTEM_MENU_BAR;
                }

@Override
                public Object getBean() {
                    return MenuBar.this;
                }

@Override
                public String getName() {
                    return "useSystemMenuBar";
                }
            };
        }
        return useSystemMenuBar;
    }
    private BooleanProperty useSystemMenuBar;
    public final void setUseSystemMenuBar(boolean value) {
        useSystemMenuBarProperty().setValue(value);
    }
    public final boolean isUseSystemMenuBar() {
        return useSystemMenuBar == null ? false : useSystemMenuBar.getValue();
    }

/***************************************************************************
     *                                                                         *
     * Public API                                                              *
     *                                                                         *
     **************************************************************************/

/**
     * The menus to show within this MenuBar. If this ObservableList is modified at
     * runtime, the MenuBar will update as expected.
     * @see Menu
     */
    public final ObservableList<Menu> getMenus() {
        return menus;
    }

/** {@inheritDoc} */
    @Override protected Skin<?> createDefaultSkin() {
        return new MenuBarSkin(this);
    }

/***************************************************************************
     *                                                                         *
     * Stylesheet Handling                                                     *
     *                                                                         *
     **************************************************************************/

private static final String DEFAULT_STYLE_CLASS = "menu-bar";

private static class StyleableProperties {
        private static final CssMetaData<MenuBar, Boolean> USE_SYSTEM_MENU_BAR =
                new CssMetaData<MenuBar, Boolean>("-fx-use-system-menu-bar",
                                                        BooleanConverter.getInstance(),
                                                        false) {
            @Override public boolean isSettable(MenuBar n) {
                return n.useSystemMenuBar == null || !n.useSystemMenuBar.isBound();
            }

@Override public StyleableProperty<Boolean> getStyleableProperty(MenuBar n) {
                return (StyleableProperty<Boolean>)(WritableValue<Boolean>)n.useSystemMenuBarProperty();
            }
        };

private static final List<CssMetaData<? extends Styleable, ?>> STYLEABLES;
        static {
            final List<CssMetaData<? extends Styleable, ?>> styleables =
                new ArrayList<CssMetaData<? extends Styleable, ?>>(Control.getClassCssMetaData());
            styleables.add(USE_SYSTEM_MENU_BAR);
            STYLEABLES = Collections.unmodifiableList(styleables);
        }
    }

/**
     * @return The CssMetaData associated with this class, which may include the
     * CssMetaData of its super classes.
     * @since JavaFX 8.0
     */
    public static List<CssMetaData<? extends Styleable, ?>> getClassCssMetaData() {
        return StyleableProperties.STYLEABLES;
    }

/**
     * {@inheritDoc}
     * @since JavaFX 8.0
     */
    @Override
    public List<CssMetaData<? extends Styleable, ?>> getControlCssMetaData() {
        return getClassCssMetaData();
    }

/**
      * Most Controls return true for focusTraversable, so Control overrides
      * this method to return true, but MenuBar returns false for
      * focusTraversable's initial value; hence the override of the override.
      * This method is called from CSS code to get the correct initial value.
      * @treatAsPrivate implementation detail
      */
    @Deprecated @Override
    protected /*do not make final*/ Boolean impl_cssGetFocusTraversableInitialValue() {
        return Boolean.FALSE;
    }

}

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