code: function(bounds, position) {
          var tile = new this.tileClass(
              this, position, bounds, null, this.tileSize, this.tileOptions
          );
          this.events.triggerEvent("addtile", {tile: tile});
          return tile;
      }
docs: APIMethod: addTile
  Create a tile, initialize it, and add it to the layer div.
  
  Parameters
  bounds - {<OpenLayers.Bounds>}
  position - {<OpenLayers.Pixel>}
  
  Returns:
  {<OpenLayers.Tile>} The added OpenLayers.Tile