Many thanks for the reply. We may have to use the new features in the near future so we would anyways upgrade to the latest version only.
I have just one more query, may be you can help me with that as well. I have .Net Framework 4.5 on my system. I am still referring to the old Telerik version (just added the Telerik.Web.UI dll version-2009.01.402.20 to Visual Studio 2012 solution). I am getting the below error in design mode when I add Telerik controls to any of the pages however the controls are displayed properly and everything works as expected when I run the code/solution (I was expecting an error)? Is this the expected behavior in case the Telerik version is not compatible with the target framework?
Error Message in design mode- "Failed to create designer 'Telerik.Web.UI.RadCalender", Telerik.Web.UI, Version=2009.1.402.20, Culture = neutral, PublicKeyTone=121fae78165ba3d4"
Not sure if this error is because of the fact that I haven't added the reference to Telerik.Web.Design dll?
Web Config Entry-
<add name="Telerik" path="Telerik.Web.UI.WebResource.axd" verb="*" type="Telerik.Web.UI.WebResource, Telerik.Web.UI, Version=2009.1.402.20, Culture=neutral, PublicKeyToken=121fae78165ba3d4"/>
Again, I am not concerned about the error in the design mode, I just want to understand how come I am not getting any error when I run the solution.