title: Call stack window always empty
body: <p>After being introduced to the call stack window by <a href="http://channel9.msdn.com/blogs/matthijs/aspnet-mvc-2-basics-introduction-by-scott-hanselman" rel="noreferrer">this ASP.NET MVC video</a> I've attempted to understand how it works.</p>
  
  <p>My understanding was that it shows all of the method calls - in the order they were called.  However its always blank whilst I'm debugging - am I doing something wrong?</p>