Open Ria Services Where is AuthenticationService.EndLogin

Question

I have a silverlight app that I am trying to port to open silver, it uses openria services and the AuthenticationService.EndLogin function.

According to the metadata, the dll, namespace, class and signature are

Assembly OpenRiaServices.DomainServices.Client.dll, v2.0.5.0 
namespace OpenRiaServices.DomainServices.Client.ApplicationServices
public abstract class AuthenticationService : INotifyPropertyChanged
protected internal abstract LoginResult EndLogin(IAsyncResult asyncResult);

I grabbed this code from here, but cannot find that function or that DLL, am I missing something?

https://github.com/OpenRIAServices/OpenRiaServices