ActionScript 3.0 :: 3D : Z-Sorting Make Blinking My Sprites?

It seems that I can get working the z-Sorting on my projects.I have created 3 bubbles, which are moving following an ellipsis rotation on a 2D plan laid out in 3D on the scene. During the z-Sorting, my bubbles are blinking, as if they were constantly interchanged between them.Here is the code responsible:

private var bubbles:Vector.<Bubble> = new Vector.<Bubble>();
public function ReorderChildren()
 {[code].....

However, it seems that removing the for loop (which performs root.addChild), and apply the same sorting function upon the vector, bubbles are still blinking.

var bubbles:Vector.<Bubble> = new Vector.<Bubble>();

Adding bubbles to the scene for each (var flyer:FlyerVO in flyers) {
   
var bubble:Bubble = new Bubble(flyer);
    root.addChildAt(bubble);
    bubbles.push(bubble);[code]....
 
The simple fact that sorting the vector (which contains only references to Bubble object) make them blink.Is there any way to attach my project folder to illustrate the bug ?