title: KendoUI Drop Down List Data Source Add Item Error
body: <p>I am using JQuery to add KendoUI.DropDown Box. It binds fine with a data source and displays results as expected. But when I try to add a custom item to the data source:</p>
  
  <pre><code>// create a new data item
  dsBusinessUnit.add( { Value: "All Business Units" });
  </code></pre>
  
  <p>It gives the following error:</p>
  
  <pre><code>SCRIPT5007: Unable to get property '__count' of undefined or null reference
  </code></pre>
  
  <p>I'm binding the data source as follows, and it works fine as long as I don't add an extra item.</p>
  
  <pre><code>// business unit data source
  var dsBusinessUnit = new kendo.data.DataSource({ 
      type: "odata",                   
      transport: {        
          read: 
          {
              url: "http://sharepointservername/_vti_bin/listdata.svc/dropdownfieldfunction",
              dataType: "json"
          }
      },
      schema: {       
          model: {
              fields: {
                  Value: { type: "string" }
              }
          }
      },
      serverFiltering: true,
      serverSorting: true
  });
  </code></pre>
  
  <p>What is that I am doing wrong. I've seen examples on Telerik's website and they have provided the same syntax. I've tried including all .js files, but it doesn't seem to work. Any help would be apreciated.</p>