WPF: How hard could it be to get a SelectedItemTemplate?

http://weblog.west-wind.com/posts/2007/May/23/WPF-How-hard-could-it-be-to-get-a-SelectedItemTemplate

<Window x:Class="WPFlistboxWithClick.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">
    <Window.Resources>
        <XmlDataProvider x:Key="Provider1" XPath="Students">
            <x:XData>
                <Students xmlns="">
                    <Item Name="wangjp" Age="16"></Item>
                    <Item Name="wangjp" Age="16"></Item>
                    <Item Name="wangjp" Age="16"></Item>
                    <Item Name="wangjp" Age="16"></Item>
                    <Item Name="wangjp" Age="16"></Item>
                    <Item Name="wangjp" Age="16"></Item>
                    <Item Name="wangjp" Age="16"></Item>
                    <Item Name="wangjp" Age="16"></Item>
                </Students>
            </x:XData>
        </XmlDataProvider>
    </Window.Resources>
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="259*"/>
            <ColumnDefinition Width="258*"/>
        </Grid.ColumnDefinitions>
        <ListBox Name="ListBox1" ItemsSource="{Binding  Source={StaticResource Provider1}, XPath=Item/@Name}" SelectionChanged="ListBox1_SelectionChanged"></ListBox>
        <Grid Grid.Column="1">
            <Grid.RowDefinitions>
                <RowDefinition Height="52*"/>
                <RowDefinition Height="70*"/>
                <RowDefinition Height="88*"/>
                <RowDefinition Height="109*"/>
            </Grid.RowDefinitions>
                <Button Click="RemoveSelected"></Button>
        </Grid>
    </Grid>
</Window>

　　

 读取方法

  private void ListBox1_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            ListBox listBox = sender as ListBox;
//            string s = listBox.SelectedItem.ToString();
             XmlNode element= listBox.SelectedItem as XmlNode;
            Trace.WriteLine(element.Value);
            Trace.WriteLine("this is on selectedchanged event");
        }