public NavigationViewModel(IFolderRepository folderRepository, INavigationService navigationService)
{
_folderRepository = folderRepository;
_navigationService = navigationService;
SelectedFolder = _folderRepository.GetRootFolder();
GarbageFolder = _folderRepository.GetGarbageFolder();
if (IsInDesignMode)
{
NavigationViewMode = NavigationViewMode.Default;
}
}