public FamilleViewModel() { Title = "Browse"; familles = new ObservableCollection <Famille>(); //Famille famille1 = new Famille { Id = "0", name = "Famille 02" }; // App.Database.SaveFamilleAsync(famille1); // famille1 = new Famille { Id = "1", name = "Famille 01" }; // App.Database.SaveItemAsync(famille1); LoadItemsCommand = new Command(async() => await ExecuteLoadItemsCommand()); MessagingCenter.Subscribe <NewFamillePage, Famille>(this, "AddFamille", (obj, famille) => { var _famille = famille as Famille; familles.Add(_famille); DataStore.AddFamilleAsync(_famille); }); }