title: Dojo dGrid/dStore realtime update
body: <p>I've been trying to get my dgrid/dstore grid in realtime.
  As var as I understand the function 'Observable' is deprecated, and also it doesnt work for me. </p>
  
  <p>I've tried to update the grid via a Interval timer but then the whole grid is erased and new loaded. How to update the whole grid 'inline' without erasing, and showing 'loading data'?</p>
  
  <p>This is my basic code:</p>
  
  <pre><code>var timer = setInterval(function() {
    store.invalidate(); // Invalidate the cache
    store.fetch(); // Perform a new request for all items
    grid.refresh(); 
  }, 500);
  </code></pre>