title: Zoom in and out a ViewBox with mouse scroll and use mouse pointer location as zoom origin
body: <p>The title is pretty much self-explaining, but to add to the facts, I'm using a large <code>Canvas</code> inside my <code>ViewBox</code> and my <code>ViewBox</code> is placed inside a <code>ScrollViewer</code>. I've set the event handlers for the <code>MouseMove</code> and <code>MouseWheel</code>, and I'm using <code>myViewbox.Width</code> and <code>myViewbox.Height</code> to change the zoom level (which I'm not sure is the proper way). Now I'm stuck on how to set the zoom origin to my mouse pointer location.</p>
  
  <p>Thanks in advance.</p>