event raising on fake objects

Hi guys, I'm not certain if this is the same issue as shown in this thread (my results are a little different to ramnefors, and additionally I don't recognize that Isolate.Invoke.Event() method signature, but maybe this was the old version or something) so I just wanted to check whether my issues were related:

public class Z
   {
      public event EventHandler a;

      public void RaiseA() { throw new NotImplementedException(); }
   }

If I make a real object and raise the event (either explicitly or through a DoInstead callback) it works fine - this seems to be different to ramnefors experience.

      [Test] [Isolated]
      public void RealEvent()
      {
         var z = new Z();
         z.a += (sender, args) => Console.WriteLine("Event raised!");
         Isolate.Invoke.Event(() => z.a += null, new object[] { null, null });
         Isolate.WhenCalled(() => z.RaiseA())
            .DoInstead(context => Isolate.Invoke.Event(() => z.a += null, new object[] {null, null}));

         z.RaiseA();
      }

However doing the same for a faked object just does nothing (no error/exception thrown.)

      [Test] [Isolated]
      public void Fake()
      {
         var z = Isolate.Fake.Instance<Z>();
         z.a += (sender, args) => Console.WriteLine("Event Raised");
         Isolate.Invoke.Event(() => z.a += null, null);
         Isolate.WhenCalled(() => z.RaiseA())
            .DoInstead(context => Isolate.Invoke.Event(() => z.a += null, new object[] { null, null }));

         z.RaiseA();

Is there a way to implement such behaviour (subscribe to a faked object's event and have them raised)?