code: private void paintCheckIconEnabledAndMouseOver(Graphics2D g, int width, int height) {
          g.setPaint(iconSelectedMouseOver);
          g.drawRoundRect(0, 1, width-1, height-2, 4, 4);
      }
docs: Paint the check mark in mouse over state.
  
  @param g      the Graphics2D context to paint with.
  @param width  the width.
  @param height the height.