Get the following msg in the designer:

Error Creating Control - TraditionalLeftNav

Unable to create type 'ig:WebSplitter'. Could not load file or assembly 'System.Web.Extensions, Version=1.0.61025.0, .... or one of its dependencies.  The system cannot find the file specified.

I have in my web.config the following

<

runtime>

  <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">

     <

dependentAssembly>

        <

assemblyIdentity name="System.Web.Extensions" publicKeyToken="31bf3856ad364e35"/>

        <

bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/>

   </

dependentAssembly>

   <dependentAssembly>

      <

assemblyIdentity name="System.Web.Extensions.Design" publicKeyToken="31bf3856ad364e35"/>

      <

bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="3.5.0.0"/>

  </

dependentAssembly>

 </

assemblyBinding>

</

runtime>