title: obout tree view update from 2.0 to 3.5
body: <p>Please advice if there are any significant changes to do in my coding (C# and JS) when  I upgrade to new treeview (Obout.Ajax.UI 2.11.1026 in .net 3.5) from am using the old Treeview (from assembly obout_ASPTreeView_2_NET 2.0.41 in .net 2.0)</p>
  
  <p>We are using:
  - Load on demand using auxiliary page.
  - Virtual scrolling.</p>
  
  <p>Notes: </p>
  
  <ol>
  <li><p>The C# code changes looks relative easy and server callback (that eliminates the need for auxiliary page) looks handy.</p></li>
  <li><p>I am after possible gotchas to avoid and/or significant code changes (e.g. Server callback)</p></li>
  <li><p>There is no sample code for virtual scrolling in version 2.11 (the website shows a demo for version 2.0.41)</p></li>
  </ol>