/// <summary>
 /// Initializes a new instance of the FilteredClientsViewModel class.
 /// </summary>
 public ClientTreeViewModel(IDataService dataService)
 {
     _dataService      = dataService;
     _clientVM         = ServiceLocator.Current.GetInstance <ClientViewModel>();
     _accountVM        = ServiceLocator.Current.GetInstance <AccountViewModel>();
     _inetOrderVM      = ServiceLocator.Current.GetInstance <InetOrderViewModel>();
     _lastSelectedItem = null;
 }
 /// <summary>
 /// Initializes a new instance of the EmployeeTreeViewModel class.
 /// </summary>
 public EmployeeTreeViewModel(IDataService dataService)
 {
     _dataService = dataService;
     _employeeVM  = ServiceLocator.Current.GetInstance <EmployeeViewModel>();
     _inetOrderVM = ServiceLocator.Current.GetInstance <InetOrderViewModel>();
 }