public override async void OnNavigatedTo(object navigationParameter, NavigationMode navigationMode, Dictionary<string, object> viewModelState)
        {
            var favourites = await _sql.GetFavourites();            
            Favourites = new ObservableCollection<Directory>(favourites.OrderBy(x => x.Name));

            if (!(Favourites.Any()))
                return;

            await Task.Delay(50);
            if (Favourites.Count() == 1)
            {
                SelectedSchool1 = Favourites.First();
                SelectedSchool2 = Favourites.First();
            }
            else
            {
                SelectedSchool1 = Favourites.First();
                SelectedSchool2 = Favourites[1];
            }            
        }
 public void ExecuteTapSchoolCommand(Directory directory)
 {
     NavigationParameters.Instance.SetParameters(directory);
     _nav.Navigate(Experiences.School);
 }