Programmatically Address a Class Instance?

programming flash
1

I may be a bit backward in my thinking here, trying to fit my pre-OOP brain into OOP. I’m trying to access the instances of a class that was created with a loop, but am having trouble wrapping my brain around how I call the instances. Here are two classes that highlight my problem. Notice the inline comments. Thanks for any help!

//The document class. Imports the class (triangle graphic)
//and then tries to make a change to a specific instance every 2 sec.
package {
    import flash.display.*;
    import flash.events.*;
    import flash.utils.Timer;
    import flash.events.TimerEvent;
    import flash.display.MovieClip;

    public class DocClass extends MovieClip {
        private var termList:Array=["MSP","SEA","LAX","LON","PAR"];
        private var repeater:Timer = new Timer(2000, 0);
        private var importedClass:ImportedClass;

        public function DocClass() {
            addClass();//call the func to build triangles
            repeater.start();
            repeater.addEventListener(TimerEvent.TIMER,doSomthng);
        }
        public function addClass() {
            for (var i:int=0; i < termList.length; i++) {
                importedClass=new ImportedClass(i * 30,i * 30);
                importedClass.name=termList*;
                addChild(importedClass);
            }
        }
        public function doSomthng(e:TimerEvent) {
            trace("timer has been called");
        //HERE, I WANT TO DECREASE "LAX" ALPHA BY .1 EACH TIME 
        //TIMER FIRES HOW DO I ADDRESS OBJECT "LAX"?
        //(THIS IS A SIMPLE REMAKE OF THE PROBLEM I'M HAVING. 
        //THE ESSENSE OF MY QUESTION IS,
        //"HOW DO I PROGRAMMATICALLY ADDRESS
                //A CLASS INSTANCE?"
        }
    }
}

//the imported class--just draws a sample triangle
package {
    import flash.display.*;
    import flash.display.MovieClip;

    public class ImportedClass extends MovieClip {
        public var Xpos:int;
        public var Ypos:int;

        public function ImportedClass(Xpos,Ypos) {
            var tri:Sprite = new Sprite();
            tri.graphics.lineStyle(1);
            tri.graphics.beginFill(0x000000,1);
            tri.graphics.moveTo(25,0);
            tri.graphics.lineTo(50,25);
            tri.graphics.lineTo(0,25);
            tri.graphics.lineTo(25,0);
            tri.graphics.endFill();
            addChild(tri);
            x=Xpos;
            y=Ypos;
        }
    }
}