Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\javafx\scene\control\skin\MenuButtonSkinBase.java

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

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

import com.sun.javafx.scene.control.ControlAcceleratorSupport;
import javafx.collections.ListChangeListener;
import javafx.event.ActionEvent;
import javafx.scene.control.ContextMenu;
import javafx.scene.control.MenuButton;
import javafx.scene.control.MenuItem;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Region;
import javafx.scene.layout.StackPane;
import com.sun.javafx.scene.control.behavior.MenuButtonBehaviorBase;

/**
 * Base class for MenuButtonSkin and SplitMenuButtonSkin. It consists of the
 * label, the arrowButton with its arrow shape, and the popup.
 */
public abstract class MenuButtonSkinBase<C extends MenuButton, B extends MenuButtonBehaviorBase<C>> extends BehaviorSkinBase<C, B> {

/***************************************************************************
     *                                                                         *
     * UI Subcomponents                                                        *
     *                                                                         *
     **************************************************************************/

protected final LabeledImpl label;
    protected final StackPane arrow;
    protected final StackPane arrowButton;
    protected ContextMenu popup;

/**
     * If true, the control should behave like a button for mouse button events.
     */
    protected boolean behaveLikeButton = false;
    private ListChangeListener<MenuItem> itemsChangedListener;

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

public MenuButtonSkinBase(final C control, final B behavior) {
        super(control, behavior);

if (control.getOnMousePressed() == null) {
            control.addEventHandler(MouseEvent.MOUSE_PRESSED, e -> {
                getBehavior().mousePressed(e, behaveLikeButton);
            });
        }

if (control.getOnMouseReleased() == null) {
            control.addEventHandler(MouseEvent.MOUSE_RELEASED, e -> {
                getBehavior().mouseReleased(e, behaveLikeButton);
            });
        }

/*
         * Create the objects we will be displaying.
         */
        label = new MenuLabeledImpl(getSkinnable());
        label.setMnemonicParsing(control.isMnemonicParsing());
        label.setLabelFor(control);

arrow = new StackPane();
        arrow.getStyleClass().setAll("arrow");
        arrow.setMaxWidth(Region.USE_PREF_SIZE);
        arrow.setMaxHeight(Region.USE_PREF_SIZE);

arrowButton = new StackPane();
        arrowButton.getStyleClass().setAll("arrow-button");
        arrowButton.getChildren().add(arrow);

popup = new ContextMenu();
        popup.getItems().clear();
        popup.getItems().addAll(getSkinnable().getItems());

getChildren().clear();
        getChildren().addAll(label, arrowButton);

getSkinnable().requestLayout();

itemsChangedListener = c -> {
            while (c.next()) {
                popup.getItems().removeAll(c.getRemoved());
                popup.getItems().addAll(c.getFrom(), c.getAddedSubList());
            }
        };
        control.getItems().addListener(itemsChangedListener);

if (getSkinnable().getScene() != null) {
            ControlAcceleratorSupport.addAcceleratorsIntoScene(getSkinnable().getItems(), getSkinnable());
        }
        control.sceneProperty().addListener((scene, oldValue, newValue) -> {
            if (getSkinnable() != null && getSkinnable().getScene() != null) {
                ControlAcceleratorSupport.addAcceleratorsIntoScene(getSkinnable().getItems(), getSkinnable());
            }
        });

//        If setOnAction() is overridden the code below causes the popup to show and hide.
//        control.addEventHandler(ActionEvent.ACTION, new EventHandler<ActionEvent>() {
//                @Override public void handle(ActionEvent e) {
//                    if (!popup.isVisible()) {
//                        show();
//                    }
//                    else {
//                        hide();
//                    }
//
//                }
//            });

// Register listeners
        registerChangeListener(control.showingProperty(), "SHOWING");
        registerChangeListener(control.focusedProperty(), "FOCUSED");
        registerChangeListener(control.mnemonicParsingProperty(), "MNEMONIC_PARSING");
        registerChangeListener(popup.showingProperty(), "POPUP_VISIBLE");
    }

/** {@inheritDoc} */
    @Override public void dispose() {
        getSkinnable().getItems().removeListener(itemsChangedListener);
        super.dispose();
        if (popup != null ) {
            if (popup.getSkin() != null && popup.getSkin().getNode() != null) {
                ContextMenuContent cmContent = (ContextMenuContent)popup.getSkin().getNode();
                cmContent.dispose();
                cmContent = null;
            }
            popup.setSkin(null);
            popup = null;
        }
    }
    /***************************************************************************
     *                                                                         *
     * Control change handlers                                                 *
     *                                                                         *
     **************************************************************************/

private void show() {
        if (!popup.isShowing()) {
            popup.show(getSkinnable(), getSkinnable().getPopupSide(), 0, 0);

//            if (getSkinnable().isOpenVertically()) {
//                // FIXME ugly hack - need to work out why we need '12' for
//                // MenuButton/SplitMenuButton, but not for Menus
//                double indent = getSkinnable().getStyleClass().contains("menu") ? 0 : 12;
//                popup.show(getSkinnable(), Side.BOTTOM, indent, 0);
//            } else {
//                popup.show(getSkinnable(), Side.RIGHT, 0, 12);
//            }
        }
    }

private void hide() {
        if (popup.isShowing()) {
            popup.hide();
//            popup.getAnchor().requestFocus();
        }
    }

/**
     * Handles changes to properties of the MenuButton.
     */
    @Override protected void handleControlPropertyChanged(String p) {
        super.handleControlPropertyChanged(p);

if ("SHOWING".equals(p)) {
            if (getSkinnable().isShowing()) {
                show();
            } else {
                hide();
            }
        } else if ("FOCUSED".equals(p)) {
           // Handle tabbing away from an open MenuButton
           if (!getSkinnable().isFocused() && getSkinnable().isShowing()) {
               hide();
           }
           if (!getSkinnable().isFocused() && popup.isShowing()) {
               hide();
           }
        } else if ("POPUP_VISIBLE".equals(p)) {
            if (!popup.isShowing() && getSkinnable().isShowing()) {
                // Popup was dismissed. Maybe user clicked outside or typed ESCAPE.
                // Make sure button is in sync.
                getSkinnable().hide();
            }

if (popup.isShowing()) {
                Utils.addMnemonics(popup, getSkinnable().getScene(), getSkinnable().impl_isShowMnemonics());
            }
            else {
                Utils.removeMnemonics(popup, getSkinnable().getScene());
            }

} else if ("MNEMONIC_PARSING".equals(p)) {
            label.setMnemonicParsing(getSkinnable().isMnemonicParsing());
            getSkinnable().requestLayout();
        }
    }

/***************************************************************************
     *                                                                         *
     * Layout                                                                  *
     *                                                                         *
     **************************************************************************/

@Override protected double computeMinWidth(double height, double topInset, double rightInset, double bottomInset, double leftInset) {
        return leftInset
                + label.minWidth(height)
                + snapSize(arrowButton.minWidth(height))
                + rightInset;
    }

@Override protected double computeMinHeight(double width, double topInset, double rightInset, double bottomInset, double leftInset) {
        return topInset
                + Math.max(label.minHeight(width), snapSize(arrowButton.minHeight(-1)))
                + bottomInset;
    }

@Override protected double computePrefWidth(double height, double topInset, double rightInset, double bottomInset, double leftInset) {
        return leftInset
                + label.prefWidth(height)
                + snapSize(arrowButton.prefWidth(height))
                + rightInset;
    }

@Override protected double computePrefHeight(double width, double topInset, double rightInset, double bottomInset, double leftInset) {
        return topInset
                + Math.max(label.prefHeight(width), snapSize(arrowButton.prefHeight(-1)))
                + bottomInset;
    }

@Override protected double computeMaxWidth(double height, double topInset, double rightInset, double bottomInset, double leftInset) {
        return getSkinnable().prefWidth(height);
    }

@Override protected double computeMaxHeight(double width, double topInset, double rightInset, double bottomInset, double leftInset) {
        return getSkinnable().prefHeight(width);
    }

@Override protected void layoutChildren(final double x, final double y,
                                            final double w, final double h) {
        final double arrowButtonWidth = snapSize(arrowButton.prefWidth(-1));
        label.resizeRelocate(x, y, w - arrowButtonWidth, h);
        arrowButton.resizeRelocate(x+(w-arrowButtonWidth), y, arrowButtonWidth, h);
    }

private class MenuLabeledImpl extends LabeledImpl {
        MenuButton button;
        public MenuLabeledImpl(MenuButton b) {
            super(b);
            button = b;
            addEventHandler(ActionEvent.ACTION, e -> {
                button.fireEvent(new ActionEvent());
                e.consume();
            });
        }
    }
}

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