public void Remove(MeasurementLimit limit)
        {
            MeasurementLimits.Remove(limit);
            MeasurementLimit.AllMeasurementLimits.Remove(limit);

            SelectedItem = null;
        }
        /// <summary>
        /// При изменении коллекции городов, обновляю список для поиска городов
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void AllCitiesOnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
        {
            switch (e.Action)
            {
            case NotifyCollectionChangedAction.Add:     // если добавление
                CitiesForFind.Insert(1, e.NewItems[0] as City);
                break;

            case NotifyCollectionChangedAction.Remove:     // если удаление
                City city = e.OldItems[0] as City;
                if (city != null)
                {
                    for (int i = MeasurementLimits.Count() - 1; i >= 0; i--)
                    {
                        if (MeasurementLimits[i].City.Id == city.Id)
                        {
                            MeasurementLimits.Remove(MeasurementLimits[i]);
                        }
                    }

                    for (int i = MeasurementLimit.AllMeasurementLimits.Count() - 1; i >= 0; i--)
                    {
                        if (MeasurementLimit.AllMeasurementLimits[i].City.Id == city.Id)
                        {
                            MeasurementLimit.AllMeasurementLimits.Remove(MeasurementLimit.AllMeasurementLimits[i]);
                        }
                    }

                    if (CitiesForFind.Contains(city))
                    {
                        CitiesForFind.Remove(city);
                    }
                }
                break;

            case NotifyCollectionChangedAction.Replace:     // если замена
                CitiesForFind.Remove(e.OldItems[0] as City);
                CitiesForFind.Insert(1, e.NewItems[0] as City);
                break;
            }
        }