title: In WPF, how do I override style set by the template at the instance level?
body: <p>So I have a custom template for scrollbar.  It work great, but I would like to override the corner rounding value.  On the template, it is set like this:</p>
  
  <pre><code>    &lt;ControlTemplate x:Key="VerticalScroll" TargetType="{x:Type ScrollBar}"&gt;
          &lt;Grid&gt;
              &lt;Border Grid.RowSpan="3" CornerRadius="3" BorderBrush="DarkBlue" BorderThickness="1" Opacity=".6"&gt;&lt;/Border&gt;
  </code></pre>
  
  <p>I am creating my instance like this:</p>
  
  <pre><code>    &lt;ScrollViewer Padding="0,0,0,0"&gt;
          &lt;TextBlock  Height="23" HorizontalAlignment="Stretch" Margin="0" Name="textBlock1" Text="TextBlock" VerticalAlignment="Top" /&gt;
      &lt;/ScrollViewer&gt;
  </code></pre>
  
  <p>How do I change the CornerRadius to 6?</p>