Codice PHP:

onClipEvent 
(mouseDown) {
this.onEnterFrame=function(){
if (
this.hitTest(_root._xmouse_root._ymousefalse)) {
if (
_parent.ybar>_parent.bg-_parent.step) {
_parent.ybar _parent.bg;
}
if (
_parent.ybar<_parent.bg) {
_parent.ybar _parent.ybar+_parent.step;
}
}
setProperty("_parent.bar"_y_parent.ybar);
}

poi devi aggiungere al mouseUp

delete this.onEnterFrame;