title: Hiding the Header view in ListView
body: <p>I'm trying to add a header view to my list, and hide it all the time unless we scroll to it (like the pull-to-refresh mechanism). The problem is: if the list is not tall enough to fill the screen - the header view is shown on top of the list.</p>
  
  <p>Is there a way to hide it, and make it visible only when we scroll to it? I've been trying a lot of stuff, but I can't figure out a good and simple way to do so.</p>
  
  <p>Thanks</p>