Trying to animate with actionscript

programming flash
1

I want to have this animation where a circle appears one by one create this:

But so far it does 8 full columns.

package {

    import flash.display.*;/// circles
    import flash.events.*;/// Listener

    public class redcircleManipulator6 extends MovieClip {

        public function redcircleManipulator6() {

            ///var myTimer:Timer=new Timer(100);
            ///myTimer.addEventListener(TimerEvent.TIMER,onTick);

            var i:uint=1;
            var j:uint=1;

            addEventListener(Event.ENTER_FRAME, onTick);

            function onTick(myevent:Event) {

                ///for (var i:uint=1; i<=8; i++) {
                ///for (var j:uint=1; j<=8; j++) {

                var redCircle_mc:redcircle=new redcircle;
                redCircle_mc.x=50 * i + 50;
                redCircle_mc.y=50 * j - 25;
                redCircle_mc.alpha=0.25;
                addChild(redCircle_mc);
                j++;
                if (j == 9) {

                    j=1;
                    i++;
                    if (i == 9) {
                        removeEventListener(Event.ENTER_FRAME, onTick);
                        ///stop();
                        ///i=1;

                        ///j=1;
                    }
                }
                ///}
            }
        }
    }
}

any help would be great, thanks