BlurTo Function help

programming flash
1

Now I know I can use the MCTween classes for this, but I want to figure it out myself :m:

I have

MovieClip.prototype.blurTo = function(strength, size) {
//Blur and tween fn.
var myBlur = new flash.filters.BlurFilter(size,size,strength);
var myFilters:Array = this.filters;
myFilters.push(myBlur);
this.filters = myFilters;
var xPosT:Tween = new Tween(this, "_x", mx.transitions.easing.Elastic.easeIn, 0, 300, 3, true);

xPosT.onMotionFinished = function(){
    //How to kill blur?
}

};

What I can’t figure out for the life of me, is how to disable the blur when the object being tweened comes to a halt? Can someone help me there?