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    <TreeView x:Name="tvFiles">
      <TreeView.ItemTemplate>
        <HierarchicalDataTemplate ItemsSource="{Binding Path=ChildFileFolders}">
          <TextBlock FontWeight="Bold" Text="{Binding Path=Text}" />
          
          <HierarchicalDataTemplate.ItemTemplate>
            <DataTemplate>
              <TextBlock Text="{Binding Path=Text}"/>
            </DataTemplate>
          </HierarchicalDataTemplate.ItemTemplate>
        </HierarchicalDataTemplate>
      </TreeView.ItemTemplate>
    </TreeView>					

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    /// <summary>
    /// Implements the FileFolder class to display an logical FolderTree
    /// </summary>
    public class FileFolder
    {
        #region Fields
        Collection<FileFolder> childFileFolders;
        string text;
        #endregion

        #region Constructor
        /// <summary>
        /// Constructor of this class
        /// </summary>
        public FileFolder()
        {
            this.childFileFolders = new Collection<FileFolder>();
        }

        /// <summary>
        /// Constructor of this class
        /// </summary>
        /// <param name="text">will set the Text property</param>
        public FileFolder(string text) : this()
        {
            this.text = text;
        }
        #endregion

        #region Properties
        /// <summary>
        /// Get the collection with all childelements
        /// </summary>
        public Collection<FileFolder> ChildFileFolders
        {
            get
            {
                return this.childFileFolders;
            }
        }

        /// <summary>
        /// Set/Get the Text of this entry
        /// </summary>
        public string Text
        {
            get { return this.text; }
            set { this.text = value; }
        }
        #endregion
    }					

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            Collection<FileFolder> list = new Collection<FileFolder>();
            FileFolder root = new FileFolder();
            FileFolder rootChild1 = new FileFolder();
            FileFolder rootChild2 = new FileFolder();
            FileFolder rootSubChild1 = new FileFolder();

            root.Text = "root";
                rootChild1.Text = "rootChild1";
                    rootSubChild1.Text = "rootSubChild1";
                    rootChild1.ChildFileFolders.Add(rootSubChild1);
                rootChild2.Text = "rootChild2";
                root.ChildFileFolders.Add(rootChild2);
                root.ChildFileFolders.Add(rootChild1);
            list.Add(root);
            tvFiles.ItemsSource = list;