title: Problem setting selectedvalue for combobox in xaml
body: <p>Here is a snippet of my xaml:</p>
  
  <pre><code>    &lt;ComboBox x:Name="cbo1" Width="100" SelectedValue="200"&gt;
          &lt;ComboBoxItem Name="n1"&gt;100&lt;/ComboBoxItem&gt;
          &lt;ComboBoxItem Name="n2"&gt;200&lt;/ComboBoxItem&gt;
      &lt;/ComboBox&gt;
  </code></pre>
  
  <p>Why doesn't this work ? The '200' is not selected when I run it.
  Ideally, I am trying to do SelectedValue="{Binding MyValue}".</p>