Motion tween new problem

ahoy there me hearties

Ive got a bit of a dilemma…

new Tween(clip,"_x",Bounce.easeInOut,clip._x,Stage.width,6,false);
new Tween(clip,"_x",Bounce.easeInOut,clip._x,Stage.height,7,false);

what would be the correct way to write this to make clip go to the center of the stage and stop? At the moment it takes off to the left, never to be seen again…

i would really appreciate help