Populating treeview from xml data with xmldataprovider

I have tried to do this task but i don't know what's the problem????

<Window x:Class="WpfApplication5.Window3"
    xmlns="http://ift.tt/o66D3f"
    xmlns:x="http://ift.tt/mPTqtT"

    Title="Window3" Height="390" Width="700" Loaded="Window_Loaded">
<Window.Resources>
    <XmlDataProvider x:Key="Shared"
     XPath="/qtpRep:ObjectRepository"></XmlDataProvider>

    <HierarchicalDataTemplate x:Key="keywords">
        <TextBox Text="{Binding XPath=@Class}" />
    </HierarchicalDataTemplate>
    <HierarchicalDataTemplate x:Key="rootTemplate" ItemsSource="{Binding XPath=qtpRep:Objects/qtpRep:Object}" ItemTemplate="{StaticResource keywords}">
        <StackPanel Orientation="Horizontal">
            <TextBlock Text="( " />
            <TextBox Text="{Binding XPath=@Name}"/>
            <TextBlock Text=")" />
        </StackPanel>
    </HierarchicalDataTemplate>
    <HierarchicalDataTemplate x:Key="root" ItemsSource="{Binding XPath=ChildObjects/qtpRep:Object}" ItemTemplate="{StaticResource keywords}">
        <StackPanel Orientation="Horizontal">
            <TextBlock Text="( " />
            <TextBox Text="{Binding XPath=@Name}"/>
            <TextBlock Text=")" />
        </StackPanel>
    </HierarchicalDataTemplate>
</Window.Resources>
<Grid>
    <TreeView Margin="0,0,0,148">
        <TreeViewItem
            ItemsSource="{Binding Source={StaticResource Shared}, XPath=qtpRep:Objects}" ItemTemplate="{StaticResource root}" Grid.ColumnSpan="2" />

    </TreeView>
    <Button Content="Button" Height="82" HorizontalAlignment="Left" Margin="166,266,0,0" Name="button1" VerticalAlignment="Top" Width="4" />
    <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="174,283,0,0" Name="button2" VerticalAlignment="Top" Width="75" Click="button2_Click" />
</Grid>

This is XAML code

  <qtpRep:ObjectRepository xmlns:qtpRep="http://ift.tt/1AVjbNM">

      <qtpRep:Objects>

           <qtpRep:Object Class="Window" Name="Your PC information">
      <qtpRep:ChildObjects>

             <qtpRep:Object Class="WinObject" Name="OUTILBARREBOUTON">


            .........

This is a portion of my XML file but it contains the essential structure (Objects contain object and object contains childobject and child object contain object)

  public partial class Window3 : Window
 {
    XmlDataProvider Shared;

    public Window3()
    {
        InitializeComponent();
    }


    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        Shared = FindResource("Shared") as XmlDataProvider;

    }


    private void button2_Click(object sender, RoutedEventArgs e)
    {
         var xmlDocument = new XmlDocument();

        xmlDocument.Load("D:\\shared_repository.xml");

        Shared.Document = xmlDocument;
    }