public SelectAircraftVersionViewModel()
 {
     _model = new AircraftModel();
     _filterList = new ObservableCollection<IAircraftCategory>(new AircraftCategoryFactory().CreateAircraftCategories());
     _selectedFilterValue = _filterList[0];
     SelectedItems = new ObservableCollection<IAircraft>(_model.GetSelectedAircrafts());
 }
 public SelectAircraftFamilyViewModel()
 {
     _model = new AircraftModel();
     InitializeDataSource();
 }