You can use one of the constructors of the generated context class which has a connection parameter. The value can be either a connection name, pointing to a connection string in the configuration file, or the whole connection string. So all you need to do is get the connection string from the used and pass it to the constructor of the context.
Hope that helps.
the Telerik team
SP1 for Q3’11 of Telerik OpenAccess ORM is available for download.