private ObservableCollection <Plant> BuildPlantDropDown()
        {
            List <Plant> list = new List <Plant>();

            list = _serviceAgent.GetPlantsReadOnly(ClientSessionSingleton.Instance.CompanyID).ToList();
            list.Add(new Plant());
            list.Sort((x, y) => string.Compare(x.Name, y.Name));

            return(new ObservableCollection <Plant>(list));
        }