Rotating while following the motion guide

hey guys… me again. and im stuck… again. :trout:

anwyayz… im trying to make this ball… and as it follows the motion guide, it keeps on rotating… i put this code on the ball (mc)

onClipEvent(enterFrame){
this._rotation +=9;
}

the ball rotates… but it doesnt follow the motion guide… can anyone help me out please?? :cowboy: thanks in advance!!!