title: How can I get the VerticalOffset of a LongListSelector in WP8
body: <p>In WP7, the LongListSelector had a underlying ScrollViewer, from which I could recover the vertical offset of the list. But in Windows Phone 8, there's no underlying ScrollViewer nor any similar class that provides me with that VerticalOffset property.</p>
  
  <p>I've been searching and didn't find anything. I could settle with a function that gives the first visible element in the list, but I haven't found anything either. The ItemRealized event is not useful for that, as it doesn't give the exact item that is being shown on top of the viewport.</p>