title: Disable zooming in and out of scrollviewer in Windows 8 metro app
body: <p>I  am using RichTextBlock to show some text, and the RichTextBlock is in a scrollviewer, the code is shown as below:</p>
  
  <pre><code>&lt;ScrollViewer Grid.Column="0"&gt;
              &lt;Grid&gt;
                  &lt;Grid.RowDefinitions&gt;
                      &lt;RowDefinition/&gt;
                      &lt;RowDefinition/&gt;
                  &lt;/Grid.RowDefinitions&gt;
                  &lt;StackPanel Orientation="Vertical" Margin="12,0"&gt;
                      &lt;TextBlock x:Name="TitleRun" FontSize="26" FontWeight="SemiBold" /&gt;
                  &lt;/StackPanel&gt;
                  &lt;RichTextBlock x:Name="MRichTextBlock" Grid.Row="1" Padding="12" FontSize="18"&gt;
                  &lt;/RichTextBlock&gt;
              &lt;/Grid&gt;
          &lt;/ScrollViewer&gt;
  </code></pre>
  
  <p>When my app is runing in a tablet pc, as long as I use two fingers to pinch in and out at the scrollviewer area, the RichTextBlock will zoom in or out, which is not expected.</p>
  
  <p>So I'm wondering how to disable the zooming behavior in this situation.</p>
  
  <p>Thanks in advance.</p>