Scrolling Issue in Virtualized TreeView

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.NET

WPF

.NET4

treeview

At .NET 4.0 . In a Vritualized TreeView（has 10000 items） , when expanding a item - scroll position would jump to some other place making expanded node and its children NOT visible . Is there any way to fix this?

https://code.msdn.microsoft.com/windowsdesktop/Changing-selection-in-a-6a6242c8#content

The attached code works well at .NET 3.5 . However at .NET 4.0 , it appears the same problem.

Belows are my demo codes

<TreeView ItemsSource="{Binding}" VirtualizingStackPanel.IsVirtualizing="True"  VirtualizingStackPanel.VirtualizationMode="Standard">
            <TreeView.ItemTemplate>
                <HierarchicalDataTemplate ItemsSource="{Binding Parts}">
                    <TextBlock Text="{Binding Name}"/>
                    <HierarchicalDataTemplate.ItemTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding}"/>
                        </DataTemplate>
                    </HierarchicalDataTemplate.ItemTemplate>
                </HierarchicalDataTemplate>
            </TreeView.ItemTemplate>
        </TreeView>

 public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            IList<Car> list = new List<Car>();
            for (int i = 0; i < 5000; i ++)
            {
                list.Add(new Car() {Name = "test1" + i});
            }

            foreach (var car in list)
            {
                car.Parts = new List<string>();
                for (int i = 0; i < 500; i++)
                {
                    car.Parts.Add("asdf" + i);
                }
            }

            this.DataContext = list;
        }
    }

    public class Car
    {
        public string Name { get; set; }

        public List<string> Parts { get; set; }
    }