/// <summary>
        /// Заполнить результат возврата.
        /// </summary>
        /// <param name="returnContol">Задача.</param>
        /// <param name="performer">Исполнитель.</param>
        /// <param name="documentIsReturned">Признак возврата документа.</param>
        public static void SetReturnResult(Sungero.Docflow.ICheckReturnTask returnContol, IUser performer, bool documentIsReturned)
        {
            var document = returnContol.DocumentGroup.OfficialDocuments.First();

            var tracking = GetTrackingByTask(returnContol);
            if (tracking == null)
            {
                return;
            }

            if (documentIsReturned)
            {
                var resultReturned = Docflow.OfficialDocumentTracking.ReturnResult.Returned;
                if (tracking.ReturnResult != resultReturned)
                {
                    var accessRights = document.AccessRights;
                    tracking.ReturnResult = (accessRights.CanUpdate(performer) && accessRights.CanRegister(performer)) ?
                                            resultReturned : Docflow.OfficialDocumentTracking.ReturnResult.AtControl;
                }
            }
            else
            {
                tracking.ReturnResult = null;
                tracking.ReturnDate   = null;
            }
        }
        /// <summary>
        /// Получить строку выдачи.
        /// </summary>
        /// <param name="returnContol">Задача.</param>
        /// <returns>Коллекция выдачи.</returns>
        public static IOfficialDocumentTracking GetTrackingByTask(Sungero.Docflow.ICheckReturnTask returnContol)
        {
            var document = returnContol.DocumentGroup.OfficialDocuments.First();

            return(document.Tracking.Where(r => Equals(r.ReturnTask, returnContol)).FirstOrDefault());
        }