Flash - Tile Objects In Grid AS3

I want to put an array of objects into a grid. I know the code is simple but somehow I'm not getting what I want.

Code:
const PADDING:Number = 10:
const COL:Number = Math.floor(Math.sqrt(tiles.length);
const ROW:Number = Math.floor(Math.sqrt(tiles.length);
for(var i:int = 0; i< COL; i++) {
var tile:TileSprite = tiles[i];
tile.x = i * tile.width + PADDING;
for(var j:int = 0; j < ROW; j++) {
tile.y = j * tile.height + PADDING;
}}

Notes:
- The array is declared else where as a public variable
- This is to be part of a game engine I'm building so I want it as flexible as possible
- The tiles as reading their properties for an XML file. But I don't want to use the XML to hard code the tiles' positions.