title: Scroll management in LongListSelector
body: <p>In my WP8 app I'm trying to implement a functionality that will allow me to save <code>LongMultiListSelector</code>'s scroll position and scroll it to that position at a later time (after tombstoning for example). It proved to be quite a quest and despite some progress I still have questions.</p>
  
  <p>As I understand it now I'll need the following things for this to work:</p>
  
  <ol>
  <li><p>Obviously <strong>an ability to scroll to a specified item</strong> which I now have. (<code>LongMultiListSelector</code>, despite being an extension of <code>LongListSelector</code>, does not have <code>ScrollTo</code> method, although <code>LongListSelector</code> can be found in <code>LongMultiListSelector</code>'s visual tree and that is what I've done).</p>
  
  <p>1.1. <strong>Ability To scroll to a specified item with animation</strong> and this one I haven't solved yet. It is not that important but having it would be nice. After some searching I've found out that once <code>LongListSelector</code> had <code>AnimateTo</code> method but currently it has it not.</p></li>
  <li><p><strong>Ability to find out what items of <code>LongListSelector</code> are currently visible on screen</strong> so I can save index of one of these visible items and then scroll to it. This one I also have not solved yet and it is very important.</p>
  
  <p>After some searching I've found this question: <a href="https://stackoverflow.com/questions/7124262/wp7-toolkit-update-removed-getitemsinview-from-the-longlistselector">WP7 Toolkit Update Removed GetItemsInView() from the LongListSelector</a>. Is says that in former times <code>LongListSelector</code> had a <code>GetItemsInView</code> function, at a later times it had <code>Link</code> and <code>Unlink</code> events especially for this purpose. Currently <code>LongListSelector</code> has neither of these options.  </p>
  
  <p>So the main question is what should I do now to find visible items in <code>LongListSelector</code>?</p></li>
  </ol>