Listener Objects and XML List Components

I was given some code here that allowed me to populate a list component with my XML.  That thread and code is here:

Now, I'm trying to understand how my listener can know how to associate the item that was clicked on in the list with a different item in my xml. Here is my listener object:

var nodes:Array = _root.songList.firstChild.childNodes;

for(var i:Number = 0; i < nodes.length; i++){
      var children:Array = nodes[i].childNodes;
      _root.song_list.addItem(children[0].firstChild.nodeValue, children);
      var listener:Object = new Object();
      listener.change = function(evt:Object):Void
      var data:Object =;
_root.song_list.addEventListener("change", listener);

It's watching change to the list componet with the instance name of song_list.  The code I have works, I'm just trying to understand it so I can implement it in a slightly different way elsewhere.  I need to understand how the listener know which node was selected so I can access other associated data for that node (if I'm saying that correctly).
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you get in you function as parameter "evt:Object", this event object contains properties (properties that contain information about the event) for example:      <<----         a reference to the component instance broadcasting the event

so in this case, instead of:
you can write: is a cell you update and it has properties like data and label.

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Aspirin99Author Commented:
I'm just not making the connection. I'll study some more and see if I can ask the question better.
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