title: Specify Command for MenuItem in a DataTemplate
body: <p>I have a context menu. It's bound to some collection and it has a defined ItemTemplate like this:</p>
  
  <pre><code>&lt;ContextMenu
      ItemsSource={Binding ...}
      ItemTemplate={StaticResource itemTemplate}
      /&gt;
  </code></pre>
  
  <p>itemTemplate is a simple DataTemplate with a TextBlock:</p>
  
  <pre><code>&lt;DataTemplate x:Key="itemTemplate"&gt;
      &lt;TextBlock Text={Binding ...} /&gt;
  &lt;/DataTemplate&gt;
  </code></pre>
  
  <p>How do I bind Command property for MenuItem to the underlying object's property?</p>