Problem with adding child AFTER tween

1

I have a MC with a sprite in it. I give it a wee tween

Tweener.addTween(mainImageBox, {height:355, time:1, delay:1, transition:“elastic”});

All fine and dandy but when I add a child

mainImageBox.addChild(loaderAnimationMC);

The child (loaderAnimationMC) is all scaled up, is there a way to prevent this?

Many thanks,

AK