Telerik Controls not able to see the design

Hi,
   
           When i am trying to use the telerik grid i am getting the following screen shot in the design of my user control.Can you please tell me what instance i had missed.

<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>
<%@ Register Assembly="Telerik.Sitefinity" Namespace="Telerik.Sitefinity.Web.UI"
TagPrefix="sf" %>
<%@ Register Assembly="Telerik.Sitefinity" Namespace="Telerik.Sitefinity.Modules.Ecommerce.Catalog.Web.UI.Fields"
TagPrefix="sfCatalog" %>
<%@ Register Assembly="Telerik.Sitefinity" Namespace="Telerik.Sitefinity.Web.UI.FieldControls" TagPrefix="sitefinity" %>
<%@ Register TagPrefix="sitefinity" Namespace="Telerik.Sitefinity.Web.UI.Fields" Assembly="Telerik.Sitefinity" %>
<sitefinity:FormManager ID="formManager" runat="server" />

<telerik:RadGrid ID="rjsdha" runat="server"></telerik:RadGrid>

I am attaching the error screen shot.

Thanks
Suresh

 

Hello,

 Can you please submit your code behind where you are using this grid? If you are trying to use a version of RadControls higher than the one provided in your version of Sitefinity you will run into problems. What version of Sitefinity and what version of Telerik.Web.UI do you have?