code: public Cell<Separator> addSeparator (boolean vertical) {
  		Cell<Separator> cell = add(new Separator()).padTop(2).padBottom(2);
  
  		if (vertical)
  			cell.fillY().expandY();
  		else {
  			cell.fillX().expandX();
  			row();
  		}
  
  		return cell;
  	}
docs: Adds vertical or horizontal {@link Separator} widget to table with padding top, bottom 2px with fill and expand properties.
  If vertical == false then inserts new row after separator (not before!)