title: Get relative position with extjs
body: <p>What's the proper way to get the position of an element on the page relative to the document?</p>
  
  <p>offsety/x is the jquery variant:  <a href="http://docs.jquery.com/CSS/offset" rel="nofollow">http://docs.jquery.com/CSS/offset</a></p>
  
  <p><strong>I need the EXTJS variant please.</strong></p>
  
  <p><strong>Edit</strong></p>
  
  <p>Possible problem.
  Because grid components are not part off the dom, the grid height is not taken into
  consideration. I think I need a callback on the reload function off the grid, but I don´t yet know how to do that.</p>