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Dobrý deň.

Poradí mi niekto, prosím, ako môžem v nižšie uvedenom programe priradiť podzložku(subItem) ku zložke v TreeView (item), na ktorú urobím dvojklik?

Ďakujem.

<Window x:Class="WpfTreViewSubItem.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <TreeView MouseDoubleClick="TreeView_MouseDoubleClick">
            <TreeViewItem Header="Jeden" Tag= "10" IsExpanded="True"/>
            <TreeViewItem Header="Dva" Tag="20" IsExpanded="True">
                <TreeViewItem Header="A" Tag="21 " IsExpanded="True">
                    <TreeViewItem Header="Alfa" Tag="211" IsExpanded="True"/>
                </TreeViewItem>
                <TreeViewItem Header="B"  Tag =" 22" IsExpanded="True"/>
            </TreeViewItem>
            <TreeViewItem Header="Tri" Tag="30" IsExpanded="True"/>
        </TreeView>
    </Grid>
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfTreViewSubItem
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void TreeView_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            // ... Create a TreeViewItem.
            TreeViewItem item = new TreeViewItem();
            item.Header = "Computer";
            item.Tag = 1;
            TreeViewItem subItem = new TreeViewItem();
            subItem.Header = "Risk";
            TreeViewItem subItem1 = new TreeViewItem();
            subItem1.Header = "Riziko";
            subItem.Items.Add(subItem1);
            item.Items.Add(subItem);
            // ... Create a second TreeViewItem.
            TreeViewItem item2 = new TreeViewItem();
            item2.Header = "PC";
            item2.ItemsSource = new string[] { "Monitor", "CPU", "Mouse", "Bluethooth" };
            // ... Get TreeView reference and add both items.
            var tree = sender as TreeView;
            var itemTag = tree.SelectedItem as TreeViewItem;
            MessageBox.Show("Header: " + itemTag.Header.ToString() + " Tag: " + itemTag.Tag.ToString());
            //?????
            //Tu niekde by to mohlo byť Foreach items in TreeView....
            // if( header== alebo Tag ==
            //?????
            tree.Items.Add(item);            
            tree.Items.Add(item2);
        }
    }
}