gistfile1.txt

var bitmapData = Assets.getBitmapData ("tiles.png");

var tileset = new Tileset (bitmapData);
tileset.addTileRect (new Rectangle (0, 0, 100, 100));

var tilemap = new Tilemap (800, 600);

var tilemapLayer = new TilemapLayer (tileset);
var tile = new Tile (0);

tilemapLayer.addTile (tile);
tilemap.addLayer (tilemapLayer);
addChild (tilemap);