tiling effect in flash

Hi,

I am trying to get a row by row tiling mask effect, so the image builds up. The problem is the code I have written only adds the from left to right (columns) rather than rows.

I think I am getting close. Can anyone help?

import caurina.transitions.*;
 
var squareHolder:MovieClip = new MovieClip();
addChild(squareHolder);
cameraImg.mask = squareHolder;
 
for(var i:uint=0; i<10; i++) {
	for(var j:uint=0; j<15; j++) {
 
 
	
var square:Sprite = new Sprite();
 
square.graphics.beginFill(0x0000FF);
square.graphics.drawRect(0,0,100,100);
square.graphics.endFill();
 
 
 
square.x = square.x + i*50;
square.y = square.y + j*50 ;
square.scaleX = 0;
square.scaleY = 0;
 
squareHolder.addChild(square);
 
 Tweener.addTween(square, {scaleX:1, time:5, transition:"easeOutBack", delay: i/20 });
 Tweener.addTween(square, {scaleY:1, time:5, transition:"easeOutBack", delay: i/20 });
 
}
 
 
}

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