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

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

import javafx.scene.Node;
import javafx.scene.control.Label;
import javafx.scene.control.Skin;
import javafx.scene.control.Tooltip;

/**
 * CSS based skin for Tooltip. It deals mostly with show hide logic for
 * Popup based controls, and specifically in this case for tooltip. It also
 * implements some of the Skin interface methods.
 *
 * TooltipContent class is the actual skin implementation of the tooltip.
 */
public class TooltipSkin implements Skin<Tooltip> {
    private Label tipLabel;

private Tooltip tooltip;

public TooltipSkin(Tooltip t) {
        this.tooltip = t;
        tipLabel = new Label();
        tipLabel.contentDisplayProperty().bind(t.contentDisplayProperty());
        tipLabel.fontProperty().bind(t.fontProperty());
        tipLabel.graphicProperty().bind(t.graphicProperty());
        tipLabel.graphicTextGapProperty().bind(t.graphicTextGapProperty());
        tipLabel.textAlignmentProperty().bind(t.textAlignmentProperty());
        tipLabel.textOverrunProperty().bind(t.textOverrunProperty());
        tipLabel.textProperty().bind(t.textProperty());
        tipLabel.wrapTextProperty().bind(t.wrapTextProperty());
        tipLabel.minWidthProperty().bind(t.minWidthProperty());
        tipLabel.prefWidthProperty().bind(t.prefWidthProperty());
        tipLabel.maxWidthProperty().bind(t.maxWidthProperty());
        tipLabel.minHeightProperty().bind(t.minHeightProperty());
        tipLabel.prefHeightProperty().bind(t.prefHeightProperty());
        tipLabel.maxHeightProperty().bind(t.maxHeightProperty());

// RT-7512 - skin needs to have styleClass of the control
        // TODO - This needs to be bound together, not just set! Probably should
        // do the same for id and style as well.
        tipLabel.getStyleClass().setAll(t.getStyleClass());
        tipLabel.setStyle(t.getStyle());
        tipLabel.setId(t.getId());
    }

@Override public Tooltip getSkinnable() {
        return tooltip;
    }

@Override public Node getNode() {
        return tipLabel;
    }

@Override public void dispose() {
        tooltip = null;
        tipLabel = null;
    }
}

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