In a class that extends JComboBox:
        setRenderer(new DefaultListCellRenderer() {
            public Component getListCellRendererComponent(
                   JList list, Object value, int index, boolean isSelected,
                   boolean cellHasFocus) {
                super.getListCellRendererComponent(list, value, index, 
                        isSelected, cellHasFocus);
                setTe<----------Ctrl+Space here does not show "setText()"
            }
        });