Function which sets the proper draw order for isometric tiles in BW.

BW_DrawOrder.as

public function updateDrawOrder ():void {
    // resets and populates draw layer with world tiles
    R.thisWorld.tiles.sortOn("worldY", Array.NUMERIC);
    layerWorld.members = [];
    for each(var tile:MapTile in R.thisWorld.tiles) {
        layerWorld.add(tile);
    }
    add(layerWorld);
}