code: public Rectangle closeRectFor(final int tabIndex) {
          final Rectangle rect = rects[tabIndex];
          final int x = rect.x + rect.width - CLOSE_ICON_WIDTH - CLOSE_ICON_RIGHT_MARGIN;
          final int y = rect.y + (rect.height - CLOSE_ICON_WIDTH) / 2;
          final int width = CLOSE_ICON_WIDTH;
          return new Rectangle(x, y, width, width);
      }
docs: Helper-method to get a rectangle definition for the close-icon
  
  @param tabIndex
  @return