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POMVVM Listbox DataTemplate SelectedItem
 

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    <p>I am using a ListBox with a <code>DataTemplate</code> as shown below (xaml simplified and variable names changed).</p> <pre><code>&lt;ListBox ItemsSource="{Binding Path=ObservCollectionItems}" SelectedItem="{Binding Path=SelectedItemVar, Mode=TwoWay}"&gt; &lt;ListBox.ItemTemplate&gt; &lt;DataTemplate&gt; &lt;StackPanel&gt; &lt;TextBlock Text="{Binding SomeVar}" /&gt; &lt;Border&gt; &lt;StackPanel&gt; &lt;Button Content="String1" Command="{Binding DataContext.Command1} RelativeSource={RelativeSource FindAncestor, ListBox, 1}}" /&gt; &lt;Button Content="String2" Command="{Binding DataContext.Command2} RelativeSource={RelativeSource FindAncestor, ListBox, 1}}" /&gt; &lt;/StackPanel&gt; &lt;/Border&gt; &lt;/StackPanel&gt; &lt;/DataTemplate&gt; &lt;ListBox.ItemTemplate&gt; &lt;/ListBox&gt; </code></pre> <p>I need the SelectedItemVar (dependency property) to update when I click on one of the buttons. SelectedItemVar is then used for the respective button's command. SelectedItemVar does update when I click on the <code>TextBlock</code> or the <code>Border</code>, but not when I click either button. I found a non-MVVM solution to this problem <a href="https://stackoverflow.com/questions/765984/wpf-listboxitems-with-datatemplates-how-do-i-reference-the-clr-object-bound-to">here</a>. I do not want to add code in the file-behind to solve this, as they did in the link.</p> <p>Is there a clean solution that can be done in XAML. Beyond the non-MVVM solutions, I have not found anyone with this problem. I would have thought this was fairly common.</p> <p>Finally, I found this <code>Command="{Binding DataContext.CommandName} RelativeSource={RelativeSource FindAncestor, ListBox, 1}</code> for the Command binding. I do not fully understand what it is doing, but I do know that the command wasn't firing when I was binding directly to <code>CommandName</code>.</p>
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    1. COBe sure to put your SelectedItem binding before your ItemsSource binding. Otherwise, when the ItemsSource unbinds, the SelectedItem will get a setter call of null.
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    2. COI will make sure that the bindings are setup in that order. Thanks for the pointer.
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