code: function (x, y) {
              // clearing tile
              this.layerData[x][y] = null;
              // erase the corresponding area in the canvas
              if (this.preRender) {
                  this.canvasRenderer.clearRect(x * this.tilewidth, y * this.tileheight, this.tilewidth, this.tileheight);
              }
          }
docs: clear the tile at the specified position
  @name clearTile
  @memberOf me.TMXLayer
  @public
  @function
  @param {Number} x X coordinate (in map coordinates: row/column)
  @param {Number} y Y coordinate (in map coordinates: row/column)
  @example
  me.game.world.getChildByType(me.TMXLayer).forEach(function(layer) {
  // clear all tiles at the given x,y coordinates
  layer.clearTile(x, y);
  });