@Override
 public Component getListCellRendererComponent(
     JList<? extends E> list, E value, int index, boolean isSelected, boolean cellHasFocus) {
   label.setText(Objects.toString(value, ""));
   this.list = list;
   this.index = index;
   if (isSelected) {
     setBackground(list.getSelectionBackground());
     label.setForeground(list.getSelectionForeground());
   } else {
     setBackground(index % 2 == 0 ? EVEN_COLOR : list.getBackground());
     label.setForeground(list.getForeground());
   }
   MutableComboBoxModel m = (MutableComboBoxModel) list.getModel();
   if (index < 0 || m.getSize() - 1 <= 0) {
     setOpaque(false);
     deleteButton.setVisible(false);
     label.setForeground(list.getForeground());
   } else {
     boolean f = index == rolloverIndex;
     setOpaque(true);
     deleteButton.setVisible(true);
     deleteButton.getModel().setRollover(f);
     deleteButton.setForeground(f ? Color.WHITE : list.getForeground());
   }
   return this;
 }
 @Override
 public void actionPerformed(ActionEvent e) {
   MutableComboBoxModel m = (MutableComboBoxModel) list.getModel();
   if (m.getSize() > 1) {
     m.removeElementAt(index);
     comboBox.showPopup();
   }
 }