title: CascadingDropDown Error - 'options' is null or not an object
body: <p>I have five <code>DropDownList</code>s linked together with the <code>CascadingDropDown</code> AJAX control. When it's running locally, they work fine. However when running on the production server over the internet, I get this error every time I select a new item:</p>
  
  <pre><code>'options' is null or not an object
  </code></pre>
  
  <p>Debugging this shows the function that's causing it (it's JS from the <code>CascadingDropDown</code> control):</p>
  
  <pre><code>_clearItems : function() {
      /// &lt;summary&gt;
      /// Clear the items from the drop down
      /// &lt;/summary&gt;
      /// &lt;returns /&gt;
  
      var e = this.get_element();
      while (0 &lt; e.options.length) {
          e.remove(0);
      }
  },
  </code></pre>
  
  <p>Does anyone have any ideas as to why it's doing this? I suspect it's because it takes longer to load the items over the internet and somehow this is affect the control?</p>
  
  <p>I'm running .NET 3.5.</p>
  
  <p>Thanks in advance.</p>