title: How to change ScrollBar style for SurfaceScrollViewer?
body: <p>I have a WPF application, I need to change the width for a vertical scroll-bar.
  Possibly using XAML.</p>
  
  <p>Any idea how to do it?</p>
  
  <pre><code>&lt;Custom:SurfaceScrollViewer HorizontalScrollBarVisibility="Disabled" VerticalScrollBarVisibility="Auto" Grid.ColumnSpan="3" Margin="10,18,0,20" Grid.Row="1" Grid.RowSpan="2"&gt;
      &lt;FlowDocumentScrollViewer x:Name="Viewer"
          VerticalScrollBarVisibility="Disabled"
          HorizontalScrollBarVisibility="Disabled"
          IsEnabled="False" Background="{x:Null}"
          HorizontalAlignment="Left"
          VerticalAlignment="Center"&gt;
          &lt;FlowDocument
              &lt;Paragraph&gt;
                  &lt;Run Text=""/&gt;
              &lt;/Paragraph&gt;
          &lt;/FlowDocument&gt;
      &lt;/FlowDocumentScrollViewer&gt;
  &lt;/Custom:SurfaceScrollViewer&gt;
  </code></pre>