Tween Class - calling Function

Question

What am I doing wrong?  I have been using the Tween Class in AS2 for years.  This is how I have been using it.
//Beginning of my Flash file
import mx.transitions.Tween;
import mx.transitions.easing.*;
function fadeon(mcname:String) {
    new Tween(mcname, "_alpha", Strong.easeOut, 0, 100, 1.5, true);
//This is placed on Frames where I want to call this particular Tween
fadeon(mymovieclipsname);
Similiar setup for AS3 with no errors when I run it.  The only problem is it doens't work. 
import fl.transitions.Tween;
import fl.transitions.easing.*;
function fadeon(mcname:String):void {
    new Tween(mcname, "alpha", Strong.easeOut, 0, 100, 1.5, true);
//on Frames where I want to call this particular Tween
mymovieclipsname.fadeon();
if I run this portion the same as AS2 I get this lovely Compiler Error message.
1067: Implicit coercion of a value of type flash.display:MovieClip to an unrelated type String.
Any thoughts or help wold be greatly appreciated.

Answer 1

Note that a better solution for AS3 is to simply create a Class that does the tween (to itself), then apply that to each bullet and leave the parent out of it. I'd probably have done the same thing in AS2 as well, but I learned As1>As3>As2, so my experience is not representative.
Here's the Class that I use to do this (note I didn't use a Tween for this task as they have the danger to go out of memory before the tween is done unless you store a reference to them):
package view.effects {
import flash.display.Sprite;
import flash.events.Event;
//view.effects.SimpleFadeIn
public class SimpleFadeIn extends Sprite {
  public function SimpleFadeIn() {
   super();
   addEventListener(Event.ADDED_TO_STAGE, startFade);
  protected function startFade(e:Event):void {
   alpha = 0;
   addEventListener(Event.ENTER_FRAME, doFade);
   addEventListener(Event.REMOVED_FROM_STAGE, cleanUp);
  protected function doFade(e:Event):void {
   if (alpha < 1) {
    alpha += .04;
   } else {
    cleanUp(e);
  protected function cleanUp(e:Event):void {
   removeEventListener(Event.ENTER_FRAME, doFade);
   removeEventListener(Event.REMOVED_FROM_STAGE, cleanUp);
Note that the reason the path to the Class is there in a comment is so team members can copy and paste it into the Base Class for a MC they want to apply this behavior to.