Tiled class is used to render background and other visual components. Constructor has five parameters: number of column and rows, image and tile width and height. Constructor splits image to tiles (according to set tile width and height), which may be used to fill a tiled object. By default, the object is filled by first tile. Other tiles may be added by fillCells(). This function takes index of tile:
this._tiled = new Tiled(40, 30, "app://img/world.png", 16, 16);
// fill bottom row by diferent tiles
this._tiled.fillCells(0, 29, 40, 1, 1);
// add tiles to the layer
this._layers.append(this._tiled);