passing string from broadcast messenger event to other function

Hello,

I am using Advanced CSharp Messenger (http://wiki.unity3d.com/index.php?title=Advanced_CSharp_Messenger) for my event system. It works pretty good so far but I want to seperate the script that has the event listeners and the scripts that actually change game elements. So I put listeners with the event functions in my interface script like this (please note that GameEvent.POSITION_UPDATED is just a string):

     void Awake() {
         Debug.Log ("Creating listeners...");
         Messenger.AddListener<Vector3>(GameEvent.POSITION_UPDATED, EventPositionUpdated);
     }
     void OnDestroy() {
         Messenger.RemoveListener<Vector3>(GameEvent.POSITION_UPDATED, EventPositionUpdated);
     }
 
     private void EventPositionUpdated(Vector3 data) { 
             otherClass.ChangeStuff ([here i want to pass along event string], data);
     }

So now my question; what is the best way to pass along GameEvent.POSITION_UPDATED to the OtherClass.ChangeStuff function? I tried adding a string parameter to EventPositionUpdated() so it would become EventPositionUpdated(string event, Vector3 data) but apperently Advanced CSharp Messenger doesn't recognize that or I am epic failing somewhere.

ps: I want to compare the event string in the ChangeStuff function so that function knows what to do with the passed along data.

Thanks for taking the time.