Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\javafx\webkit\theme\ContextMenuImpl.java

/*
 * Copyright (c) 2011, 2014, 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.webkit.theme;

import java.util.logging.Logger;
import java.util.logging.Level;

import javafx.event.ActionEvent;
import javafx.event.EventHandler;

import javafx.scene.control.Separator;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.MenuItem;
import javafx.scene.control.Menu;
import javafx.scene.control.CheckMenuItem;

import javafx.collections.ObservableList;
import javafx.collections.FXCollections;

import com.sun.webkit.ContextMenuItem;

public final class ContextMenuImpl extends com.sun.webkit.ContextMenu {

private final static Logger log = Logger.getLogger(ContextMenuImpl.class.getName());

private final ObservableList<ContextMenuItem> items =
            FXCollections.observableArrayList();

@Override protected void show(final ShowContext showContext, int x, int y) {
        if (log.isLoggable(Level.FINE)) {
            log.log(Level.FINE, "show at [{0}, {1}]", new Object[] {x, y});
        }
        final ContextMenu popupMenu = new ContextMenu();

popupMenu.setOnAction(t -> {
            MenuItem item = (MenuItem) t.getTarget();
            log.log(Level.FINE, "onAction: item={0}", item);
            showContext.notifyItemSelected(((MenuItemPeer)item).getItemPeer().getAction());
        });

popupMenu.getItems().addAll(fillMenu());
        PopupMenuImpl.doShow(popupMenu, showContext.getPage(), x, y);
    }

@Override protected void appendItem(ContextMenuItem item) {
        insertItem(item, items.size());
    }

@Override protected void insertItem(ContextMenuItem item, int index) {
        if (log.isLoggable(Level.FINE)) {
            log.log(Level.FINE, "item={0}, index={1}", new Object[] {item, index});
        }
        if (item == null) {
            return;
        }
        items.remove(item);

if (items.size() == 0) {
            items.add(item);
        } else {
            items.add(index, item);
        }
    }

@Override protected int getItemCount() {
        return items.size();
    }

private MenuItem createMenuItem(ContextMenuItem item) {
        log.log(Level.FINE, "item={0}", item);

if (item.getType() == ContextMenuItem.SUBMENU_TYPE) {
            MenuImpl menu = new MenuImpl(item.getTitle());
            if (item.getSubmenu() != null) {
                menu.getItems().addAll(((ContextMenuImpl)item.getSubmenu()).fillMenu());
            }
            return menu;

} else if (item.getType() == ContextMenuItem.ACTION_TYPE) {

MenuItem mi = null;
            if (item.isChecked()) {
                mi = new CheckMenuItemImpl(item);
            } else {
                mi = new MenuItemImpl(item);
            }
            mi.setDisable(!item.isEnabled());
            return mi;

} else if (item.getType() == ContextMenuItem.SEPARATOR_TYPE) {
            return new SeparatorImpl(item);
        }
        throw new java.lang.IllegalArgumentException("unexpected item type");
    }

private ObservableList<MenuItem> fillMenu() {
        ObservableList<MenuItem> s = FXCollections.observableArrayList();
        for (ContextMenuItem item: items) {
            s.add(createMenuItem(item));
        }
        return s;
    }

private interface MenuItemPeer {
        public ContextMenuItem getItemPeer();
    }

private static final class MenuItemImpl extends MenuItem implements MenuItemPeer {
        private final ContextMenuItem itemPeer;
        private MenuItemImpl(ContextMenuItem itemPeer) { super(itemPeer.getTitle()); this.itemPeer = itemPeer; }
        @Override public ContextMenuItem getItemPeer() { return itemPeer; }
    }

private static final class CheckMenuItemImpl extends CheckMenuItem implements MenuItemPeer {
        private final ContextMenuItem itemPeer;
        private CheckMenuItemImpl(ContextMenuItem itemPeer) { this.itemPeer = itemPeer; }
        @Override public ContextMenuItem getItemPeer() { return itemPeer; }
    }

private static final class MenuImpl extends Menu {
        private MenuImpl(String text) { super(text); }
    }

static final class SeparatorImpl extends MenuItem implements MenuItemPeer {
        private final ContextMenuItem itemPeer;
        SeparatorImpl(ContextMenuItem itemPeer) {
            this.itemPeer = itemPeer;
            setGraphic(new Separator());
            setDisable(true);
        }
        @Override public ContextMenuItem getItemPeer() { return itemPeer; }
    }
}

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