1- register the Telerik dll in the '.ascx' file with fully qualified name of the assembly.
<%@ Register Namespace=" namespace used " Assembly=" assembly full defined with name and public key token" TagPrefix="prefix used in your controls" %>
2- create new folder in your solution and add the Telerik dll in this folder. 3- Open your solution 'package.package' file. >>Select Advanced in package designer >>Press Add button then Add Existing Assembly to add assembly to the package. >>Navigate to the folder you created before in the solution and select the Telerik dll. >> Select Deployment Target for the dll 'GlobalAssemblyCache' or 'WebApplication'. >> Under Safe Controls click add button and enter your assembly name and Namespace >>Deploy your solution and enjoy :)
Sincerely, Ibrahim Hebish | SoftwareDeveloper | Portal Services | EX EgyptNetwork(Com) | GlobeSoft(Com) M: +201281744594 Email: pronto.cs@gmail.com