Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\javafx\scene\control\skin\SplitMenuButtonSkin.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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 *
 *
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 */

package com.sun.javafx.scene.control.skin;

import javafx.scene.control.SplitMenuButton;
import javafx.scene.input.MouseEvent;

import com.sun.javafx.scene.control.behavior.SplitMenuButtonBehavior;

/**
 * Skin for SplitMenuButton Control.
 */
public class SplitMenuButtonSkin extends MenuButtonSkinBase<SplitMenuButton, SplitMenuButtonBehavior> {

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

/**
     * Creates a new SplitMenuButtonSkin for the given SplitMenu.
     *
     * @param splitMenuButton the SplitMenuButton
     */
    public SplitMenuButtonSkin(final SplitMenuButton splitMenuButton) {
        super(splitMenuButton, new SplitMenuButtonBehavior(splitMenuButton));

/*
         * The arrow button is the only thing that acts like a MenuButton on
         * this control.
         */
        behaveLikeButton = true;
        // TODO: do we need to consume all mouse events?
        // they only bubble to the skin which consumes them by default
        arrowButton.addEventHandler(MouseEvent.ANY, event -> {
            event.consume();
        });
        arrowButton.setOnMousePressed(e -> {
            getBehavior().mousePressed(e, false);
            e.consume();
        });
        arrowButton.setOnMouseReleased(e -> {
            getBehavior().mouseReleased(e, false);
            e.consume();
        });

label.setLabelFor(splitMenuButton);
    }
}

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