title: WPF PriorityBinding and MultiBinding
body: <p>Is it possible to mix and PriorityBinding MultiBinding in WPF?</p>
  
  <pre><code>&lt;TextBlock&gt;
    &lt;TextBlock.Text&gt;
      &lt;PriorityBinding TargetNullValue="{x:Static sys:String.Empty}"&gt;
        &lt;Binding Path="Client.Address.PoBox" /&gt;
        &lt;MultiBinding StringFormat="{}{0} {1}"&gt;
          &lt;Binding Path="Client.Address.Street.Name" /&gt;
          &lt;Binding Path="Client.Address.Street.Number" /&gt;
        &lt;/MultiBinding&gt;
      &lt;/PriorityBinding&gt;
    &lt;/TextBlock.Text&gt;
  &lt;/TextBlock&gt;
  </code></pre>