■ ムービークリップの境界ボックスの座標を調べるには

//メインタイムラインのフレームアクション
star_mc.onPress = function(){
this._mc = _root.attachMovie("mcBorder","border_mc",999);
this.border_obj = this.getBounds(_root);
this._mc._x = this.border_obj.xMin;
this._mc._width = this.border_obj.xMax - this.border_obj.xMin;
this._mc._y = this.border_obj.yMin;
this._mc._height = this.border_obj.yMax - this.border_obj.yMin;
};
star_mc.onRelease = Box.prototype.onReleaseOutside = function(){
this._mc.removeMovieClip();
};