title: WPF DataTrigger for TextBlock to control Text
body: <p>I have TextBlock</p>
  
  <pre><code>&lt;TextBlock&gt;                  
      &lt;Run Text="{Binding Path=Value1}" /&gt;
      &lt;Run Text="-" /&gt;
      &lt;Run Text="{Binding Path=Value2}" /&gt;
  &lt;/TextBlock&gt;
  </code></pre>
  
  <p>I need to add such trigger: If Value2 = XXX, TextBlock should display only Value1.
  Is that possible to do without converters and ViewModel modifications?</p>