when i try to expand the treeitem,the selectitem's focus changes wrong

the treeview looks like this:
root
      nodeA
              leafa
              leafb
              leafc
      nodeB
              leafd
              leafe
              leaff

first,i select leafd,and leafd get the focus.
then,i try to expand nodeA,this time,leafd and leafb both get the focus.



the source:

package test;

/**

 * Copyright (c) 2008, 2012 Oracle and/or its affiliates.

 * All rights reserved. Use is subject to license terms.

 */

import javafx.application.Application;

import javafx.scene.Group;

import javafx.scene.Scene;

import javafx.stage.Stage;

import javafx.scene.control.TreeView;

import javafx.scene.control.TreeItem;

import java.util.Arrays;

 

/**

 * An implementation of the TreeView control displaying an expandable tree root

 * node.

 *

 * @see javafx.scene.control.TreeView

 */

public class TreeViewSample extends Application {

    private void init(Stage primaryStage) {

        Group root = new Group();

        primaryStage.setScene(new Scene(root));

        final TreeItem<String> treeRoot = new TreeItem<String>("Root node");
        treeRoot.getChildren().addAll(Arrays.asList(

                new TreeItem<String>("Child Node 1"),

                new TreeItem<String>("Child Node 2"),

                new TreeItem<String>("Child Node 3")));

        treeRoot.getChildren().get(1).getChildren().addAll(Arrays.asList(

                new TreeItem<String>("Child Node 4"),

                new TreeItem<String>("Child Node 5"),

                new TreeItem<String>("Child Node 6"),

                new TreeItem<String>("Child Node 7"),

                new TreeItem<String>("Child Node 8"),

                new TreeItem<String>("Child Node 9"),

                new TreeItem<String>("Child Node 10"),

                new TreeItem<String>("Child Node 11"),

                new TreeItem<String>("Child Node 12")));
 

        treeRoot.getChildren().get(2).getChildren().addAll(Arrays.asList(

                new TreeItem<String>("Child Node 4"),

                new TreeItem<String>("Child Node 5"),

                new TreeItem<String>("Child Node 6"),

                new TreeItem<String>("Child Node 7"),

                new TreeItem<String>("Child Node 8"),

                new TreeItem<String>("Child Node 9"),

                new TreeItem<String>("Child Node 10"),

                new TreeItem<String>("Child Node 11"),

                new TreeItem<String>("Child Node 12")));

 

        final TreeView treeView = new TreeView();

        treeView.setShowRoot(true);

        treeView.setRoot(treeRoot);

        treeRoot.setExpanded(true);

 

        root.getChildren().add(treeView);

    }

 

 

    @Override public void start(Stage primaryStage) throws Exception {

        init(primaryStage);

        primaryStage.show();

    }

    public static void main(String[] args) { launch(args); }

}


it is a bug or there is a solution?