Edit C:\Program Files\Java\jdk1.8.0_121\javafx\scene\control\cell\DefaultTreeCell.java

/*
 * Copyright (c) 2013, 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 javafx.scene.control.cell;

import javafx.beans.InvalidationListener;
import javafx.beans.Observable;
import javafx.beans.WeakInvalidationListener;
import javafx.scene.Node;
import javafx.scene.control.TreeCell;
import javafx.scene.control.TreeItem;
import javafx.scene.layout.HBox;

import java.lang.ref.WeakReference;

/*
 * Package-protected class used by cell implementations to handle graphics changes
 * to TreeItem.
 */
class DefaultTreeCell<T> extends TreeCell<T> {

private HBox hbox;

private WeakReference<TreeItem<T>> treeItemRef;

private InvalidationListener treeItemGraphicListener = observable -> {
        updateDisplay(getItem(), isEmpty());
    };

private InvalidationListener treeItemListener = new InvalidationListener() {
        @Override public void invalidated(Observable observable) {
            TreeItem<T> oldTreeItem = treeItemRef == null ? null : treeItemRef.get();
            if (oldTreeItem != null) {
                oldTreeItem.graphicProperty().removeListener(weakTreeItemGraphicListener);
            }

TreeItem<T> newTreeItem = getTreeItem();
            if (newTreeItem != null) {
                newTreeItem.graphicProperty().addListener(weakTreeItemGraphicListener);
                treeItemRef = new WeakReference<TreeItem<T>>(newTreeItem);
            }
        }
    };

private WeakInvalidationListener weakTreeItemGraphicListener =
            new WeakInvalidationListener(treeItemGraphicListener);

private WeakInvalidationListener weakTreeItemListener =
            new WeakInvalidationListener(treeItemListener);

public DefaultTreeCell() {
        treeItemProperty().addListener(weakTreeItemListener);

if (getTreeItem() != null) {
            getTreeItem().graphicProperty().addListener(weakTreeItemGraphicListener);
        }
    }

void updateDisplay(T item, boolean empty) {
        if (item == null || empty) {
            hbox = null;
            setText(null);
            setGraphic(null);
        } else {
            // update the graphic if one is set in the TreeItem
            TreeItem<T> treeItem = getTreeItem();
            if (treeItem != null && treeItem.getGraphic() != null) {
                if (item instanceof Node) {
                    setText(null);

// the item is a Node, and the graphic exists, so
                    // we must insert both into an HBox and present that
                    // to the user (see RT-15910)
                    if (hbox == null) {
                        hbox = new HBox(3);
                    }
                    hbox.getChildren().setAll(treeItem.getGraphic(), (Node)item);
                    setGraphic(hbox);
                } else {
                    hbox = null;
                    setText(item.toString());
                    setGraphic(treeItem.getGraphic());
                }
            } else {
                hbox = null;
                if (item instanceof Node) {
                    setText(null);
                    setGraphic((Node)item);
                } else {
                    setText(item.toString());
                    setGraphic(null);
                }
            }
        }
    }

@Override public void updateItem(T item, boolean empty) {
        super.updateItem(item, empty);
        updateDisplay(item, empty);
    }
}

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