Tween into position when a movie clip is automaticcally centered to stage

programming flash
1

I hav movieclips in a flash document that i have autocenter when the stage is scaled code is something like this:

clients_mc.y = Math.round((stage.stageHeight/2)-15);

stage.addEventListener(Event.RESIZE, resizeClients);

function resizeClients(event = null){
clients_mc.y = Math.round((stage.stageHeight/2)-15);
};

any way to make it esae in to position or bounce, something?