Spark.effects.Fade and effectEnd (Gumbo)

Question

Hello all,
I'm sure this is going to be a really daft question and I'll slap my head when someone points me in the right direction, but I can't seem to figure it out... Basically I'm trying to use the spark.effects.Fade class on a sprite that I have - that works no problem at all (it's surprisingly verbose though in AS3). But what I can't seem to do is add a handler for when the effect ends (effectEnd).
The documentation ( http://help.adobe.com/en_US/Flex/4.0/langref/spark/effects/Fade.html - which is largely MXML orientated from what I can see) suggests that effectEnd is inherited from mx.effects.Effect - could this be where the issue is coming in. Do I need to cast the Fade object?
This is the code that I'm using at the moment:
var fadeAni:spark.effects.Fade = new spark.effects.Fade( );
fadeAni.target = _tip;
fadeAni.alphaFrom = 1;
fadeAni.alphaTo = 0;
fadeAni.duration = 500;
fadeAni.effectEnd =function ( e:Event ) {
    removeChild( _tip );
    _tip = null;
fadeAni.play();
And with that mxmlc says:
$ mxmlc app.mxml
Loading configuration file /usr/local/flex_sdk_4.0.0.10485/frameworks/flex-config.xml
/Users/allan/Desktop/Flex/flex_test/components/ToolTip.as(130): col: 13 Error: Access of possibly undefined property effectEnd through a reference with static type spark.effects:Fade.
fadeAni.effectEnd =function ( e:Event ){
Many thanks,
Allan

Answer 1

This is all correct, but here's a couple of tips for de-verbosifying effects:
- You don't need an "alphaFrom" if the sprite already has the alpha value you want - it will pick up the current value as the value it starts from.
- You don't need a 'duration' if you're animating for 500 ms - that's the default
- Fade works with the state values when used in a transition. So, for example, if an object exists in one state and is removed in the next state, then a transition with a Fade (no arguments declared) on the target will automatically fade it out. Examples on this here:
http://graphics-geek.blogspot.com/2009/08/video-fade-effect-in-flex-4.html
(yes, this is an mxml solution, or at least a solution that involves states, as opposed to the dynamic approach in the Allan's original example, but it seemed worth mentioning, because effects are tuned to be particularly simple when used in transitions).
Chet.