当所有项都在包装器中时，如何编写TreeView的DataTemplates？

public class TreeItemData
{
    public string Header { get; set; }
    public List<TreeItemData> Children { get; set; } = new List<TreeItemData>();
}

public class TreeItemWrapper
{
    public TreeItemData Data { get; set; }
}

<Window.Resources>
    <!-- DataTemplate for the root wrapper -->
    <DataTemplate DataType="{x:Type local:TreeItemWrapper}">
        <TreeViewItem ItemsSource="{Binding Data.Children}">
            <TreeViewItem.Header>
                <TextBlock Text="{Binding Data.Header}" />
            </TreeViewItem.Header>
        </TreeViewItem>
    </DataTemplate>

    <!-- DataTemplate for the child items -->
    <DataTemplate DataType="{x:Type local:TreeItemData}">
        <StackPanel Orientation="Horizontal">
            <TextBlock Text="{Binding Header}" />
        </StackPanel>
    </DataTemplate>
</Window.Resources>

<TreeView x:Name="MyTreeView">
    <!-- The root item is wrapped in a TreeItemWrapper -->
    <TreeViewItem ItemsSource="{Binding Items}">
        <TreeViewItem.Header>
            <TextBlock Text="Root" />
        </TreeViewItem.Header>
    </TreeViewItem>
</TreeView>

public partial class MainWindow : Window
{
    public ObservableCollection<TreeItemWrapper> Items { get; set; } = new ObservableCollection<TreeItemWrapper>();

    public MainWindow()
    {
        InitializeComponent();
        DataContext = this;

        // Populate the tree view with data
        var rootData = new TreeItemData { Header = "Root" };
        rootData.Children.Add(new TreeItemData { Header = "Child 1" });
        rootData.Children.Add(new TreeItemData { Header = "Child 2" });

        Items.Add(new TreeItemWrapper { Data = rootData });
    }
}