title: Aligning content in a WPF Viewbox
body: <p>I have a Viewbox with <code>Stretch=Uniform</code> in order to not distort the content.
  However, when the frame window is wider or taller than the content, the Viewbox content is always centered.</p>
  
  <p>I cannot seem to find any content alignment options on the Viewbox.
  Is there a way to do this?</p>