title: How do you handle a ComboBox SelectionChanged in MVVM?
body: <p>For those doing pure MVVM, how do you handle a ComboBox SelectionChanged event without reverting to code behind?</p>
  
  <p>I tried e.g. <a href="http://marlongrech.wordpress.com/2008/12/13/attachedcommandbehavior-v2-aka-acb/" rel="noreferrer">AttachedBehaviors </a>but Event="SelectedChanged" is not supported:</p>
  
  <pre><code>&lt;ComboBox&gt;
      &lt;ComboBoxItem Content="Test1"&gt;
          &lt;c:CommandBehaviorCollection.Behaviors&gt;
              &lt;c:BehaviorBinding Event="SelectionChanged" 
                                 Command="{Binding SelectedChanged}"
                                 CommandParameter="MainBorder123"/&gt;
          &lt;/c:CommandBehaviorCollection.Behaviors&gt;
      &lt;/ComboBoxItem&gt;
      &lt;ComboBoxItem Content="Test2"/&gt;
      &lt;ComboBoxItem Content="Test3"/&gt;
  &lt;/ComboBox&gt;
  </code></pre>