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    copied!<p>The problem is caused by the two-way binding. When you select an item in <code>ListBox</code> 1, it sets the <code>SelectedItem</code> property on <code>ListBox</code> 2. This "overwrites" the <code>Binding</code> set on <code>ListBox2.SelectedItem</code>. If you want, you can verify in <a href="http://blois.us/Snoop/" rel="nofollow noreferrer">Snoop</a>.</p> <p>As for how to achieve your goal, you should use a collection view and the <a href="http://msdn.microsoft.com/en-us/library/system.windows.controls.primitives.selector.issynchronizedwithcurrentitem.aspx" rel="nofollow noreferrer"><code>IsSynchronizedWithCurrentItem</code></a> property. Both <code>ListBox</code>es should bind to the same collection view and be synchronized with the current item. As a result, selecting an item in one <code>ListBox</code> will force the other <code>ListBox</code> to synchronize with that selected item.</p> <p>Here's the minimum XAML you need to make this happen:</p> <pre><code>&lt;Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="300" Width="300"&gt; &lt;Window.Resources&gt; &lt;Style TargetType="ListBox"&gt; &lt;Style.Setters&gt; &lt;Setter Property="Width" Value="150"/&gt; &lt;Setter Property="Margin" Value="4"/&gt; &lt;/Style.Setters&gt; &lt;/Style&gt; &lt;!-- define the XML data source as a resource --&gt; &lt;XmlDataProvider x:Key="TestData" XPath="/Books"&gt; &lt;x:XData&gt; &lt;Books xmlns=""&gt; &lt;Book&gt; &lt;Title&gt;Book 1&lt;/Title&gt; &lt;Author&gt;Mister 1&lt;/Author&gt; &lt;/Book&gt; &lt;Book&gt; &lt;Title&gt;Book 2&lt;/Title&gt; &lt;Author&gt;Mister 2&lt;/Author&gt; &lt;/Book&gt; &lt;Book&gt; &lt;Title&gt;Book 3&lt;/Title&gt; &lt;Author&gt;Mister 3&lt;/Author&gt; &lt;/Book&gt; &lt;Book&gt; &lt;Title&gt;Book 4&lt;/Title&gt; &lt;Author&gt;Mister 4&lt;/Author&gt; &lt;/Book&gt; &lt;Book&gt; &lt;Title&gt;Book 5&lt;/Title&gt; &lt;Author&gt;Mister 5&lt;/Author&gt; &lt;/Book&gt; &lt;Book&gt; &lt;Title&gt;Book 6&lt;/Title&gt; &lt;Author&gt;Mister 6&lt;/Author&gt; &lt;/Book&gt; &lt;/Books&gt; &lt;/x:XData&gt; &lt;/XmlDataProvider&gt; &lt;CollectionViewSource x:Key="cvs" Source="{Binding Source={StaticResource TestData}, XPath=Book}"/&gt; &lt;/Window.Resources&gt; &lt;Grid&gt; &lt;StackPanel Orientation="Horizontal"&gt; &lt;StackPanel&gt; &lt;Label HorizontalContentAlignment="Center"&gt;Listbox 1&lt;/Label&gt; &lt;ListBox x:Name="box1" ItemsSource="Source={StaticResource cvs}}" IsSynchronizedWithCurrentItem="True"&gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;Label Content="{Binding XPath=Title}"/&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;/ListBox&gt; &lt;/StackPanel&gt; &lt;StackPanel&gt; &lt;Label HorizontalContentAlignment="Center"&gt;Listbox 2&lt;/Label&gt; &lt;ListBox x:Name="box2" ItemsSource="{Binding Source={StaticResource cvs}}" IsSynchronizedWithCurrentItem="True"&gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;Label Content="{Binding XPath=Title}"/&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;/ListBox&gt; &lt;/StackPanel&gt; &lt;/StackPanel&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre>
 

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