Full Browser (centered without resizing window)

[font=Arial]What I do wrong in the code below, that object is not centered unless the window resized. It cause unpleasant “jump” beside bad positioning at the start:[/font]

Stage.align = “LT”;
Stage.scaleMode = “noScale”;
stageListener = new Object();
stageListener.onResize = function ()
{

}

Stage.addListener(stageListener);

stageListener.onResize = function ()
{

var stageXCenter = Stage.width * .5;
var stageYCenter = Stage.height * .5;

myClip._x = stageXCenter;
myClip._y = stageYCenter;
}