addChild MC dissapears on stop();

programming flash
1

I’m adding a movieclip from my library to a movieclip on stage that has a motion tween. The added movieclip needs to be part of the tween. When the tween is complete I have stop(); to keep it from repeating, however, when the timeline reaches the stop(); my added movie clip dissapears.

import flash.display.DisplayObjectContainer;
import flash.display.Sprite;
import flash.utils.getDefinitionByName;


var myClassInstance = new (getDefinitionByName("MyClass") as Class);



function loadHomePage():void{
    paper.blankSheet1.addChildAt(myClassInstance, 1);
    paper.gotoAndPlay("s1");
}
    
loadHomePage();