Edit C:\Program Files\Java\jdk1.8.0_121\com\sun\javafx\scene\control\skin\ComboBoxBaseSkin.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 com.sun.javafx.scene.control.behavior.ComboBoxBaseBehavior;
import javafx.geometry.HPos;
import javafx.geometry.VPos;
import javafx.scene.Node;
import javafx.scene.control.ComboBoxBase;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Region;
import javafx.scene.layout.StackPane;

import java.util.List;

public abstract class ComboBoxBaseSkin<T> extends BehaviorSkinBase<ComboBoxBase<T>, ComboBoxBaseBehavior<T>> {

private Node displayNode; // this is normally either label or textField

protected StackPane arrowButton;
    protected Region arrow;

/** The mode in which this control will be represented. */
    private ComboBoxMode mode = ComboBoxMode.COMBOBOX;
    protected final ComboBoxMode getMode() { return mode; }
    protected final void setMode(ComboBoxMode value) { mode = value; }

public ComboBoxBaseSkin(final ComboBoxBase<T> comboBox, final ComboBoxBaseBehavior<T> behavior) {
        // Call the super method with the ComboBox we were just given in the
        // constructor, as well as an instance of the behavior class.
        super(comboBox, behavior);

// open button / arrow
        arrow = new Region();
        arrow.setFocusTraversable(false);
        arrow.getStyleClass().setAll("arrow");
        arrow.setId("arrow");
        arrow.setMaxWidth(Region.USE_PREF_SIZE);
        arrow.setMaxHeight(Region.USE_PREF_SIZE);
        arrow.setMouseTransparent(true);

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

if (comboBox.isEditable()) {
            //
            // arrowButton behaves like a button.
            // This is strongly tied to the implementation in ComboBoxBaseBehavior.
            //
            arrowButton.addEventHandler(MouseEvent.MOUSE_ENTERED,  (e) -> getBehavior().mouseEntered(e));
            arrowButton.addEventHandler(MouseEvent.MOUSE_PRESSED,  (e) -> { getBehavior().mousePressed(e);  e.consume(); });
            arrowButton.addEventHandler(MouseEvent.MOUSE_RELEASED, (e) -> { getBehavior().mouseReleased(e); e.consume();});
            arrowButton.addEventHandler(MouseEvent.MOUSE_EXITED, (e) -> getBehavior().mouseExited(e));

}
        getChildren().add(arrowButton);

// When ComboBoxBase focus shifts to another node, it should hide.
        getSkinnable().focusedProperty().addListener((observable, oldValue, newValue) -> {
            if (!newValue) {
                focusLost();
            }
        });

// Register listeners
        registerChangeListener(comboBox.editableProperty(), "EDITABLE");
        registerChangeListener(comboBox.showingProperty(), "SHOWING");
        registerChangeListener(comboBox.focusedProperty(), "FOCUSED");
        registerChangeListener(comboBox.valueProperty(), "VALUE");
    }

protected void focusLost() {
        getSkinnable().hide();
    }
    /**
     * This method should return a Node that will be positioned within the
     * ComboBox 'button' area.
     */
    public abstract Node getDisplayNode();

/**
     * This method will be called when the ComboBox popup should be displayed.
     * It is up to specific skin implementations to determine how this is handled.
     */
    public abstract void show();

/**
     * This method will be called when the ComboBox popup should be hidden.
     * It is up to specific skin implementations to determine how this is handled.
     */
    public abstract void hide();

/**
     * 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 ("EDITABLE".equals(p)) {
            updateDisplayArea();
        } else if ("VALUE".equals(p)) {
            updateDisplayArea();
        }
    }

protected void updateDisplayArea() {
        final List<Node> children = getChildren();
        final Node oldDisplayNode = displayNode;
        displayNode = getDisplayNode();

// don't remove displayNode if it hasn't changed.
        if (oldDisplayNode != null && oldDisplayNode != displayNode) {
            children.remove(oldDisplayNode);
        }

if (displayNode != null && !children.contains(displayNode)) {
            children.add(displayNode);
            displayNode.applyCss();
        }
    }

private boolean isButton() {
        return getMode() == ComboBoxMode.BUTTON;
    }

@Override protected void layoutChildren(final double x, final double y,
            final double w, final double h) {
        if (displayNode == null) {
            updateDisplayArea();
        }

final double arrowWidth = snapSize(arrow.prefWidth(-1));
        final double arrowButtonWidth = (isButton()) ? 0 :
                arrowButton.snappedLeftInset() + arrowWidth +
                arrowButton.snappedRightInset();

if (displayNode != null) {
            displayNode.resizeRelocate(x, y, w - arrowButtonWidth, h);
        }

arrowButton.setVisible(! isButton());
        if (! isButton()) {
            arrowButton.resize(arrowButtonWidth, h);
            positionInArea(arrowButton, (x + w) - arrowButtonWidth, y,
                    arrowButtonWidth, h, 0, HPos.CENTER, VPos.CENTER);
        }
    }

@Override protected double computePrefWidth(double height, double topInset, double rightInset, double bottomInset, double leftInset) {
        if (displayNode == null) {
            updateDisplayArea();
        }

final double arrowWidth = snapSize(arrow.prefWidth(-1));
        final double arrowButtonWidth = isButton() ? 0 :
                                        arrowButton.snappedLeftInset() +
                                        arrowWidth +
                                        arrowButton.snappedRightInset();
        final double displayNodeWidth = displayNode == null ? 0 : displayNode.prefWidth(height);

final double totalWidth = displayNodeWidth + arrowButtonWidth;
        return leftInset + totalWidth + rightInset;
    }

@Override protected double computePrefHeight(double width, double topInset, double rightInset, double bottomInset, double leftInset) {
        if (displayNode == null) {
            updateDisplayArea();
        }

double ph;
        if (displayNode == null) {
            final int DEFAULT_HEIGHT = 21;
            double arrowHeight = (isButton()) ? 0 :
                    (arrowButton.snappedTopInset() + arrow.prefHeight(-1) + arrowButton.snappedBottomInset());
            ph = Math.max(DEFAULT_HEIGHT, arrowHeight);
        } else {
            ph = displayNode.prefHeight(width);
        }

return topInset+ ph + 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);
    }

// Overridden so that we use the displayNode as the baseline, rather than the arrow.
    // See RT-30754 for more information.
    @Override protected double computeBaselineOffset(double topInset, double rightInset, double bottomInset, double leftInset) {
        if (displayNode == null) {
            updateDisplayArea();
        }

if (displayNode != null) {
            return displayNode.getLayoutBounds().getMinY() + displayNode.getLayoutY() + displayNode.getBaselineOffset();
        }

return super.computeBaselineOffset(topInset, rightInset, bottomInset, leftInset);
    }
}

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