[flexcoders] How to listen for collection change event in a nested collection?

[Alexei Vinidiktov]

Hello,

I have an array collection of lessons and each lesson that has an array
collection of cards:

        [Bindable]
public class Lesson
 {
public var title:String;
 public var text:String;
 public var cards:ArrayCollection = new ArrayCollection();
}
        [Bindable]
public class Card
{
 public var question:String;
public var answer:String;
 }

I'm trying to find a way to listen for the collection change events in each
lesson's card array collection.

I tried this:
for(var i:int = 0; i < lessonList.length; ++i)
{

  lessonList[i].cards.addEventListener(CollectionEvent.COLLECTION_CHANGE,
cardsListChanged);
 }
And this:
 for each (var item:Lesson in lessonList)
{
item.cards.addEventListener(CollectionEvent.COLLECTION_CHANGE,
cardsListChanged);
}

But the events don't seem to fire.

What am I missing?


-- 
Alexei Vinidiktov