public void setUseFlatUI(boolean b) { main.setContentAreaFilled(!b); main.setFocusPainted(!b); main.setBorderPainted(!b); main.setMargin(new Insets(1, 1, 1, 1)); popper.setContentAreaFilled(!b); popper.setFocusPainted(!b); popper.setBorderPainted(!b); popper.setMargin(new Insets(1, 1, 1, 1)); setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1)); setOpaque(false); MouseAdapter ma = new MouseAdapter() { public void mouseEntered(MouseEvent e) { main.setContentAreaFilled(true); main.setBackground(new Color(216, 240, 254)); // m.getMainButton().setForeground( Color.black ); setBorder(new LineBorder(new Color(200, 200, 200), 1)); setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR)); popper.setBackground(new Color(242, 242, 242)); popper.setContentAreaFilled(true); popper.setBorder(menu.getBorder()); } public void mouseExited(MouseEvent e) { main.setContentAreaFilled(false); // c.setForeground( Color.black ); setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1)); setCursor(Cursor.getDefaultCursor()); popper.setContentAreaFilled(false); popper.setBorder(null); } }; main.addMouseListener(ma); popper.addMouseListener(ma); }