title: Scroll to a position in Scrollviewer with normal scrollanimation
body: <p>I have a metro styled app with a scrollviewer. Now I would like to scroll to a position when the user clicks a button. I tried:</p>
  
  <pre><code> MainScrollViewer.ScrollToHorizontalOffset(x);
  </code></pre>
  
  <p>But then its "jumping" there quickly. I want to have a smooth animation up to x.</p>