Программный просмотр логического и визуального дерева

<Grid>
   <Grid.RowDefinitions>
           <RowDefinition Height="auto"></RowDefinition>
           <RowDefinition></RowDefinition>
   </Grid.RowDefinitions>
   <StackPanel Margin="5" Orientation="Horizontal">
           <Button Name="Btn_visualTreeView" Padding="5" Margin="8,0,0,0"
                      Click="Btn_visualTreeView_Click">Визуальное дерево</Button>
           <GroupBox Margin="5">
                      <StackPanel>
                            <RadioButton Name="InTreeView" Margin="3" IsChecked="True">Показать в TreeView</RadioButton>
                            <RadioButton Name="InTextBox" Margin="3">Показать в TextBox</RadioButton>
                      </StackPanel>
           </GroupBox>
   </StackPanel>
   <TextBox Name="txt" Grid.Row="1" Margin="5" TextWrapping="Wrap"
               HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto"
               IsReadOnly="True" BorderBrush="#2f3bc5"></TextBox>
</Grid>

using System.Windows.Markup;
//...

public partial class MainWindow : Window
{
        public MainWindow()
        {
            InitializeComponent();
            tw.Name = "treeView";
            tw.BorderBrush = new SolidColorBrush(Colors.Blue);
            tw.BorderThickness = new Thickness(2.0);
            tw.Margin = new Thickness(5.0);
        }

        public void ShowLogicalTree(DependencyObject element)
        {
            // Очистить дерево
            tw.Items.Clear();
            // Начать обработку элементов
            ProcessElement(element, null);
        }

        private TreeView tw = new TreeView();
        
        // Новое диалоговое окно с элементом TreeView
        public void MyShowDialog()
        {
            Window win = new Window();
            win.Title = "LogicTreeDisplay";
            win.Height = 400;
            win.Width = 250;
 
            Grid grid = new Grid();

            IAddChild container = grid;
            container.AddChild(tw);

            container = win;
            container.AddChild(grid);
            ShowLogicalTree(this);

            win.ShowDialog();
        }

        public void ProcessElement(DependencyObject element, TreeViewItem previousItem)
        {
            TreeViewItem item = new TreeViewItem();
            item.Header = element.GetType().Name;
            item.IsExpanded = true;
            if (previousItem == null)
            {
                tw.Items.Add(item);
            }
            else
            {
                previousItem.Items.Add(item);
            }
            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(element); i++)
            {
                ProcessElement(VisualTreeHelper.GetChild(element, i), item);
            }
        }

        private void Btn_visualTreeView_Click(object sender, RoutedEventArgs e)
        {
            if ((bool)InTreeView.IsChecked)
            {
                MyShowDialog();
            }
        }
}