Почему то не работает приближение /удаление с флагом.

[iNils]

import mx.utils.Delegate;
import mx.transitions.Tween;
import mx.transitions.easing.*;
sofiaInitX = sofia._x;
sofiaInitY = sofia._y;
sofiaInitXScale = sofia._xscale;
sofiaInitYScale = sofia._yscale;
var tween:Tween = null;
var kf:Number = 0;
var flag:Boolean = false;
//
sofia.onRelease = Delegate.create (this, onRelease);
function onRelease () {
	var kf2:Number = null;
	if (flag) {
		kf2 = 0;
	} else {
		kf2 = 1;
	}
	tween.stop ();
	tween = new Tween (this, "kf", mx.transitions.easing.Regular.easeOut, kf, kf2, 3, true);
	tween.onMotionChanged = Delegate.create (this, onMotionChanged);
	flag = !flag;
}
function onMotionChanged () {
	sofia._xscale = sofiaInitXScale + (100 - sofiaInitXScale) * kf;
	sofia._yscale = sofiaInitYScale + (100 - sofiaInitYScale) * kf;
	sofia._x = sofiaInitX + (-315 - sofiaInitX) * kf;
	sofia._y = sofiaInitY + (-222 - sofiaInitY) * kf;
}