I am trying to get the CustomValidator to work with the RadAsyncUpload, but not having any luck.

I have tried the example from here http://www.telerik.com/community/forums/aspnet-ajax/async-upload/required-validator-and-radasyncupload.aspx but the javascript never fires. What links the 2 controls togther? Normally I would set the ControlToValidate property of the CustomValidator, but that also does not work.

I have simplified the example (Should always fail validataion), but still no luck

   <script type="text/javascript">

      function validateUpload(sender, args) {

            args.IsValid = false;

        }

   </script>

 

 <div>

     <tel:RadAsyncUpload ID="RadAsyncUpload1" runat="server" MultipleFileSelection="Automatic" />

      <asp:CustomValidator runat="server" ID="CustomValidator" ClientValidationFunction="validateUpload" ErrorMessage="Select at least a single file" />

</div>