code: public void setDrawTileBorders(boolean drawTileBorders)
      {
          boolean old = isDrawTileBorders();
          this.drawTileBorders = drawTileBorders;
          firePropertyChange("drawTileBorders", old, isDrawTileBorders());
          repaint();
      }
docs: Set if the tile borders should be drawn. Mainly used for debugging.
  @param drawTileBorders new value of this drawTileBorders