title: WP7 Converter in ResourceDictionary
body: <p>On the page we declare a converter as</p>
  
  <pre><code>&lt;phone:PhoneApplicationPage.Resources&gt;
     &lt;local:BoolToVisibilityConverter x:Key="BoolToVisibilityConverter"/&gt;
  &lt;/phone:PhoneApplicationPage.Resources&gt;
  </code></pre>
  
  <p>How to declare it in ResourceDictionary?</p>