restsharp/RestSharp — pull request #215 by PedroLamas (2012-01-28 00:01:49+00:00)
Title: Made Silverlight and Windows Phone clients send Cookies on request

I used AddCookie() method to add cookies to my RestRequest instance, but using Fiddler I managed to see that no cookies where being sent...

Apparently, this is because of adding the Domain to the System.Net.Cookie instance; if you just don't add the Domain on the Silverlight and Windows Phone version of RestSharp, all works fine, and that is just what I did.
I don't think this is even required because the CookieContainer already has information regarding the host address.