Stop drag!

Need some help real quick. I have my project set up so when a button is clicked, it makes a variable = true, creates a MC at mouse x and y position, and draged by mouse. It works, but I can’t seem to get the stopDrag(); to work now. Here is what I have.
Within the Button


on(release){
 _root.buildingsomething=true;
 _root.attachMovie ("BoxMc", "BoxMc"+ 1, getNextHighestDepth());
 _root.BoxMc1._x = _root._xmouse;
 _root.BoxMc1._y = _root._ymouse;
 _root.BoxMc1.startDrag();
 Mouse.hide();
}

In the main timeline.


BoxMc1.onMouseDown = function() {
 if(_root.buildingsomething==true){
 _root.BoxMc1.stopDrag();
 _root.buildingsomething=false;
 } 
if(_root.buildingsomething==false){
 _root.menu.gotoAndStop(3);
 }
};

But it doesn’t work. :stuck_out_tongue: