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POWP7: Why does a ListBox.ItemsPanel break my ElementName data binding?
 

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  1. POWP7: Why does a ListBox.ItemsPanel break my ElementName data binding?
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    <p>I have a Windows Phone 7 <code>ListBox</code> that binds to a list of integers. I am using the default MVVM Light template, so there is a <code>ViewModel</code> class that contains data and a simple <code>RelayCommand</code>. Here is the ListBox:</p> <pre><code>&lt;ListBox ItemsSource="{Binding MyData}"&gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;Button Content="{Binding}"&gt; &lt;i:Interaction.Triggers&gt; &lt;i:EventTrigger EventName="Click"&gt; &lt;cmd:EventToCommand Command="{Binding ElementName=ContentGrid, Path=DataContext.TestCommand}" CommandParameter="{Binding}" /&gt; &lt;/i:EventTrigger&gt; &lt;/i:Interaction.Triggers&gt; &lt;/Button&gt; &lt;/DataTemplate&gt; &lt;/ListBox.ItemTemplate&gt; &lt;/ListBox&gt; </code></pre> <p>This displays a vertical list of integers inside buttons. If you click any of them, the following command code executes and shows a pop-up: <code>new RelayCommand&lt;int&gt;(i =&gt; MessageBox.Show("Test" + i));</code></p> <p>However, if I simply add the following XAML to change to a horizontal list, the databinding fails. Nothing happens when you click the button and no error messages are written to the Output window.</p> <pre><code>&lt;ListBox.ItemsPanel&gt; &lt;ItemsPanelTemplate&gt; &lt;StackPanel Orientation="Horizontal" HorizontalAlignment="Center" /&gt; &lt;/ItemsPanelTemplate&gt; &lt;/ListBox.ItemsPanel&gt; </code></pre> <p>I have tried some other types of binding for the <code>EventToCommand</code>. For example, specifying my <code>ViewModel</code> as a static resource. It works, but is less ideal than the example above.</p> <p>Why does that <code>ItemsPanel</code> break the databinding?</p>
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    1. COSomeone mentions this problem here: http://forums.silverlight.net/forums/p/213237/503547.aspx Their problem doesn't include MVVM Light and is also specific to WP7.
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