Tween scope

I’m using tween animations imported in.

Most of my code is on my root, however there is a MC which gets dupilcated and loads in seperate xml data

atm I’m just using one alpha tween in the mc, but so far I seem to lose scope unless I load the tween class in to the MC, which is daft, seeming it gets duplicated.

the MC in question, loads in XML and displays a thumbnail gallery, the tween is onLoadComplete function and alphas the file in.

var myAlpha:Tween = new Tween (targetMC,"_alpha",Strong.easeOut,0,100,3,true);

is there a simple way of just referring to the imported tween on the root

or would I have to call a function on the root, referring to targetMC?

thanks