title: Adding ScrollViewer to Grid breaks button
body: <p>I have the following:</p>
  
  <pre><code>&lt;Button Name = "openFile" Content="Open File" HorizontalAlignment="Center" Margin="100,0,100,18" VerticalAlignment="Bottom" Click="openFile_Click"/&gt;
  &lt;ScrollViewer&gt;
          &lt;TextBlock Name="errMessage" TextWrapping="WrapWithOverflow" Margin="100, 100, 100, 100" HorizontalAlignment ="Center" VerticalAlignment="Center" RenderTransformOrigin="-5.314,2.792" Visibility="Visible" /&gt;
  &lt;/ScrollViewer&gt;
  </code></pre>
  
  <p>This breaks my button, making it unclickable. However, if I remove the scrollviewer tag, button functionality returns.</p>
  
  <p>I have a TextBlock that is meant display error information. Sometimes this can grow beyond the borders of the application and I wanted to make it scrollable. How can I do that?</p>