title: ContactPicker is not working in Windows Phone 8.1 Silverlight
body: <p>I've tried to get contact info in Windows Phone 8.1 SL app by following <a href="http://msdn.microsoft.com/en-US/library/windows/apps/xaml/jj152724" rel="nofollow">Quickstart: Selecting user contacts</a></p>
  
  <p>In my function,</p>
  
  <pre><code>    private async void PickAContactButton_Click(object sender, RoutedEventArgs e)
      {
          var contactPicker = new Windows.ApplicationModel.Contacts.ContactPicker();
          contactPicker.desiredFieldsWithContactFieldType.add(Windows.ApplicationModel.Contacts.ContactFieldType.email);
          Contact contact = await contactPicker.PickContactAsync(); // this throws System.NotImplementedException
          // Additional information: The method or operation is not implemented.
  
          if (contact != null)
          { ... }
       }
  </code></pre>
  
  <p>Exact same function works in Windows Phone 8.1 RT. <code>ContactPicker</code> class is supported in both WP 8.1 RT and WP 8.1 SL according to <a href="http://msdn.microsoft.com/pl-PL/library/windows/apps/br224913" rel="nofollow">this reference</a>.</p>
  
  <p>Any idea what is going on ?</p>