问如何在FlashAS2.0中按一下按钮动画电影剪辑

EN

var begin = 20;
var end = 380;

myButton_btn.onRelease = function() {
        tweenBall(mx.transitions.easing.Bounce.easeOut);
};
function tweenBall(easeType) {
        var begin_x = 470; //This should be the initial X position of the mc that you want to animate
        var end_x = 50;
        var begin_y = 100; //This should be the initial Y position of the mc that you want to animate
        var end_y = 100; 
        var time = 20;
        var mc = ball_mc;
        ballTween = new mx.transitions.Tween(mc, "_x", easeType, begin_x, end_x, time);
        ballTween = new mx.transitions.Tween(mc, "_y", easeType, begin_y, end_y, time);
}