title: GestureListener in ScrollViewer on Windows phone 7 does not work
body: <p>I have a prblem: If I enter this kind of xaml:</p>
  
  <pre><code>&lt;Grid Grid.Row="1"&gt;
      &lt;ScrollViewer Name="scrolViewer" VerticalAlignment="Stretch" HorizontalAlignment="Stretch" BorderBrush="AliceBlue"
              BorderThickness="5" HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto"&gt;
          &lt;Image Name="mapImage" CacheMode="BitmapCache" RenderTransformOrigin="0.5 0.5"&gt;
              &lt;Image.RenderTransform&gt;
                  &lt;CompositeTransform x:Name="transform" /&gt;
              &lt;/Image.RenderTransform &gt;
              &lt;toolkit:GestureService.GestureListener&gt;
                  &lt;toolkit:GestureListener PinchStarted="OnPinchStarted" PinchDelta="OnPinchDelta" /&gt;
              &lt;/toolkit:GestureService.GestureListener&gt;
  </code></pre>
  
  <p>Gestures does not work, but image slides as it is expected to.
  If I remove  tag - gestures begin to work.
  How do I enable guestures to zoom and rotate image inside scrollviewer or how do I create my own scrollviewer based on gestures.
  Thanx in advance!</p>