It;s obvious but here we go!


	ListCellRenderer lcr = new ListCellRenderer() {
		public Component getListCellRendererComponent(JList list, Object value, int index, boolean isSelected, boolean cellHasFocus) {
			JLabel l = new JLabel();
			l.setText(value.toString());
			l.setBackground(isSelected ? Color.red : Color.white);
			l.setForeground(isSelected ? Color.white : Color.black);
			return l;
		}
	};
	getComboBox().setRenderer(lcr); // user code end