Actionscript 3.0 :: Passing Variables With A Custom Event With TransitionManager?

trying to learn Custom Events so that I can pass a variable through to a function that's fired when a Fade Out has been completed.

i.e.

Code: Select allvar tm:TransitionManager = new TransitionManager(movieclipname_mc);
tm.addEventListener ( "allTransitionsOutDone", TriggerThis );
tm.startTransition({type:Fade, direction:Transition.OUT, duration:2, easing:Strong.easeOut});

When the Fade Out is completed, the TriggerThis function is fired...

Code: Select allfunction TriggerThis(e:Event):void {
trace('triggered');
}

I want to pass a variable to TriggerThis though and I know that I need to use a Custom Event to do this. I tried creating a .as file containing the following:

Code: Select allpackage
{
import flash.events.Event;

[code]....

But this results in errors. Can anyone shed any light on how to pass the variables after a Transition has completed?