title: Kendo DataSource $expand on multiple fields
body: <p>I'm trying to get the <code>$expand</code> directive to work as below.</p>
  
  <p>This works fine if I expand on on a single entity, but fails for both when expanding on more than one. (i.e. <code>$expand: "Product"</code>, works works fine)</p>
  
  <p>Anyone succeeded with this?</p>
  
  <pre><code>  dataSource: {
                  type: "odata",
                  transport: {
                      read: {
                          url: "odata/OrderDetail",
                          dataType: "json",
                          contentType: "application/json",
                          data: {
                              $expand: ["Product", "Category"]
                          }
                      }
  </code></pre>