/// <summary>
        /// Creates backups of all the data objects in the Vector so that changes can later be cancelled if necessary.
        /// </summary>
        protected internal override void createDataBackup()
        {
            StateMod_Well well = null;
            int           size = _data.Count;

            for (int i = 0; i < size; i++)
            {
                well = (StateMod_Well)_data[i];
                well.createBackup();
            }
        }