title: OnDemandGrid (Dgrid) won't fire a request
body: <p>When scrolling the grid, it does not fire a new request for more items when you reach the end of the 20 items</p>
  
  <p>I am using Dojo version 1.10.4.  I created a TrackableRest Store</p>
  
  <pre><code>    var TrackableRest = declare([Rest, Trackable]);
      var interceptStore = new TrackableRest({
          target: 'rest/intercepts/', 
          accepts: "application/json",
          sortParam: 'sort',         
          rangeStartParam: 'offset',
          rangeCountParam: 'limit',
          headers:{
              'Accept': "application/json",
              'Content-Type':"application/json",
              'charset':"UTF-8"             
          },
          idProperty: 'id'
      });
  </code></pre>
  
  <p>Then I created a grid:</p>
  
  <pre><code>var grid = window.grid = new CustomGrid({
      id: 'grid',
      //sort: [{property:'ELNOT'},{property:'RF_AVG'}], // Initialize sort on last name, ascending
      collection: interceptsStore,
      sort: "id",
      getBeforePut: false,
      columns: getColumns(),
      allowSelectAll: true,
      loadingMessage: 'Loading data...',
      noDataMessage: 'No results found.',
      title: "All",
      minRowsPerPage: 20,
      maxRowsPerPage: 250
  });
  </code></pre>
  
  <p>The request is sent 
  <a href="http://localhost:8080/OlympiaMap/rest/intercepts/?sort=+id&amp;offset=0&amp;limit=20" rel="nofollow">http://localhost:8080/OlympiaMap/rest/intercepts/?sort=+id&amp;offset=0&amp;limit=20</a></p>
  
  <p>And the response includes the header Content-Range with a value of items=0-20/606
   and the data looks like
  <a href="http://i.stack.imgur.com/qEiQd.png" rel="nofollow">enter image description here</a></p>