If you have a property:
public class Fred
{
   public string UserName
   {
     set
     {
        userName=value;
     }
   }
}
how do you use Rhino Mocks to check that
fred= new Fred();
fred.UserName="Jim";
is called.
Expect.Call(mockFred.UserName).SetPropertyWithArgument("Jim");
does not compile.