private DefaultListModel <String> refreshListModel ()
    {

        List<User> userList = Accounts.instance().getUserList();
        if ( ! userList.isEmpty() )
        {

            logger.debug( "Refreshing user data." );
            for ( User user : userList )
            {
                listModel.addElement( user.getName() );
            }
        } else
        {
            logger.debug( "Loading data ..." );
            Accounts.instance().load();
            userList = Accounts.instance().getUserList();
            if ( ! userList.isEmpty() )
            {
                logger.debug( "Refreshing user data." );
                for ( User user : userList )
                {
                    listModel.addElement( user.getName() );
                }
            } else
            {
                logger.debug( "No data ..." );
                listModel.clear();
            }
        }

        return listModel;
    }