Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\javafx\menu\MenuBase.java

/*
 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 */

package com.sun.javafx.menu;

import javafx.beans.property.ObjectProperty;
import javafx.beans.property.ReadOnlyBooleanProperty;
import javafx.collections.ObservableList;
import javafx.event.Event;
import javafx.event.EventHandler;

public interface MenuBase extends MenuItemBase {

// /**
// * Called when the menu will be shown.
// * 
// */
// public static EventType<Event> ON_SHOWING =
// EventTypeUtil.registerInternalEventType(Event.ANY, "ON_SHOWING");
//
// /**
// * Called when the menu is shown.
// * 
// */
// public static EventType<Event> ON_SHOWN =
// EventTypeUtil.registerInternalEventType(Event.ANY, "ON_SHOWN");
//
// /**
// * Called when the menu will be hidden.
// * 
// */
// public static EventType<Event> ON_HIDING =
// EventTypeUtil.registerInternalEventType(Event.ANY, "ON_HIDING");
//
// /**
// * Called when the menu is hidden.
// * 
// */
// public static EventType<Event> ON_HIDDEN =
// EventTypeUtil.registerInternalEventType(Event.ANY, "ON_HIDDEN");

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

/*
     * Indicates whether the menu is currently visible.
     */
    public boolean isShowing();
    public ReadOnlyBooleanProperty showingProperty();

// --- On Showing
 public ObjectProperty<EventHandler<Event>> onShowingProperty();
 /**
 * Called just prior to the menu being shown, even if the menu has
 * no items to show. Note however that this won't be called if the menu does
 * not have a valid anchor node.
 */
 public void setOnShowing(EventHandler<Event> value);
 public EventHandler<Event> getOnShowing();

// -- On Shown
 public ObjectProperty<EventHandler<Event>> onShownProperty();
 /**
 * Called just after the menu is shown.
 */
 public void setOnShown(EventHandler<Event> value);
 public EventHandler<Event> getOnShown();

// --- On Hiding
 public ObjectProperty<EventHandler<Event>> onHidingProperty();
 /**
 * Called just prior to the menu being hidden.
 */
 public void setOnHiding(EventHandler<Event> value);
 public EventHandler<Event> getOnHiding();

// --- On Hidden
 public ObjectProperty<EventHandler<Event>> onHiddenProperty();
 /**
 * Called just after the menu has been hidden.
 */
 public void setOnHidden(EventHandler<Event> value);
 public EventHandler<Event> getOnHidden();

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

public ObservableList<MenuItemBase> getItemsBase();

/**
     * If the menu is not disabled and is not already showing,
     * then this will cause the menu to be shown.
     */
    public void show();

/**
     * Hides the menu if it was previously showing, and any showing
     * submenus. If this menu is not showing, then invoking this function
     * has no effect.
     */
    public void hide();

}

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