title: Conditional element in xaml depending on the binding content
body: <p>Is it possible to display this TextBlock, only if the <code>Address.Length &gt; 0</code> ? I'd like to do this directly into the xaml, I know I could put all my controls programmatically</p>
  
  <pre><code> &lt;TextBlock Text="{Binding Path=Address}" /&gt;
  </code></pre>