diff --git a/Sources/BookApp/Composants/GroupCollection.xaml b/Sources/BookApp/Composants/GroupCollection.xaml
index bd11501..4b65068 100644
--- a/Sources/BookApp/Composants/GroupCollection.xaml
+++ b/Sources/BookApp/Composants/GroupCollection.xaml
@@ -13,7 +13,7 @@
         </ResourceDictionary>
     </ContentView.Resources>
 
-    <CollectionView ItemsSource="{Binding AuteurGroups}" IsGrouped="True" SelectionMode="Single">
+    <CollectionView ItemsSource="{Binding AuteurGroups}" IsGrouped="True" SelectionMode="Single" x:Name="groupCollectionView">
         <CollectionView.GroupHeaderTemplate>
             <DataTemplate x:DataType="model:Author">
                 <Label Text="{Binding Name}"
@@ -29,11 +29,13 @@
                     <SwipeView.LeftItems>
                         <SwipeItems>
                             <SwipeItem Text="Favorite"
-                       IconImageSource="favorite.png"
-                       BackgroundColor="LightGreen"/>
+                                       IconImageSource="favorite.png"
+                                       BackgroundColor="LightGreen"/>
                             <SwipeItem Text="Delete"
-                       IconImageSource="delete.png"
-                       BackgroundColor="LightPink"/>
+                                       IconImageSource="delete.png"
+                                       BackgroundColor="LightPink"
+                                       Command="{Binding Source={x:Reference groupCollectionView}, Path=BindingContext.RemoveBookCommand}"
+                                       CommandParameter="{Binding Id}"/>
                         </SwipeItems>
                     </SwipeView.LeftItems>
                     <StackLayout>
diff --git a/Sources/BookApp/Composants/ToggleSwitchView.xaml b/Sources/BookApp/Composants/ToggleSwitchView.xaml
index cf342df..79deb61 100644
--- a/Sources/BookApp/Composants/ToggleSwitchView.xaml
+++ b/Sources/BookApp/Composants/ToggleSwitchView.xaml
@@ -22,7 +22,7 @@
             <Label 
                 x:Name="OffLabel" 
                 Text="Prêts" 
-                Opacity="0.5"
+                Opacity="0.25"
                 VerticalTextAlignment="Center"/>
 
             <Grid
@@ -39,7 +39,7 @@
             <Label 
                 x:Name="OnLabel" 
                 Text="Emprunts" 
-                Opacity="0.5"
+                Opacity="0.25"
                 VerticalTextAlignment="Center"/>
         </StackLayout>
 
diff --git a/Sources/BookApp/Composants/ToggleSwitchView.xaml.cs b/Sources/BookApp/Composants/ToggleSwitchView.xaml.cs
index 0d5201a..c1a2b2a 100644
--- a/Sources/BookApp/Composants/ToggleSwitchView.xaml.cs
+++ b/Sources/BookApp/Composants/ToggleSwitchView.xaml.cs
@@ -13,11 +13,11 @@ public partial class ToggleSwitchView : ContentView
         if (e.Value) // Si c'est ON
         {
             OnLabel.Opacity = 1;
-            OffLabel.Opacity = 0.5;
+            OffLabel.Opacity = 0.25;
         }
         else // Si c'est OFF
         {
-            OnLabel.Opacity = 0.5;
+            OnLabel.Opacity = 0.25;
             OffLabel.Opacity = 1;
         }
     }
diff --git a/Sources/BookApp/MainPage.xaml b/Sources/BookApp/MainPage.xaml
index 0e29e3d..b7af3ed 100644
--- a/Sources/BookApp/MainPage.xaml
+++ b/Sources/BookApp/MainPage.xaml
@@ -48,7 +48,7 @@
                     <Grid RowDefinitions="Auto" Style="{StaticResource StyleCollectionGrid}" Padding="2">
                         <Grid.GestureRecognizers>
                             <TapGestureRecognizer Command="{Binding Source={x:Reference ThisPage}, Path=Nav.MenuItemsCommand}"
-                                                  CommandParameter="{Binding .}"/>
+                                                  CommandParameter="{Binding .}" NumberOfTapsRequired="1"/>
                         </Grid.GestureRecognizers>
                         <Grid.ColumnDefinitions>
                             <ColumnDefinition Width="25"/>
@@ -104,7 +104,7 @@
                     <Grid RowDefinitions="Auto" Style="{StaticResource StyleCollectionGrid}" Padding="2">
                         <Grid.GestureRecognizers>
                             <TapGestureRecognizer Command="{Binding Source={x:Reference ThisPage}, Path=Nav.MenuItemsFiltreCommand}"
-                                                  CommandParameter="{Binding .}"/>
+                                                  CommandParameter="{Binding .}" NumberOfTapsRequired="1"/>
                         </Grid.GestureRecognizers>
                         <Grid.ColumnDefinitions>
                             <ColumnDefinition Width="25" />
diff --git a/Sources/BookApp/MauiProgram.cs b/Sources/BookApp/MauiProgram.cs
index e1ef4b7..2705e80 100644
--- a/Sources/BookApp/MauiProgram.cs
+++ b/Sources/BookApp/MauiProgram.cs
@@ -29,6 +29,7 @@ namespace BookApp
             builder.Logging.AddDebug();
 #endif
             builder.Services.AddSingleton<ILibraryManager, LibraryStub>();
+            builder.Services.AddSingleton<IUserLibraryManager, UserLibraryStub>();
             builder.Services.AddSingleton<BooksViewModel>();
             builder.Services.AddSingleton<FilterViewModel>();
             builder.Services.AddSingleton<SearchBarViewModel>();
diff --git a/Sources/BookApp/Pages/DetailBook.xaml b/Sources/BookApp/Pages/DetailBook.xaml
index 98713d6..4b73472 100644
--- a/Sources/BookApp/Pages/DetailBook.xaml
+++ b/Sources/BookApp/Pages/DetailBook.xaml
@@ -23,7 +23,7 @@
                 HorizontalOptions="Start">
                     <Image.GestureRecognizers>
                         <TapGestureRecognizer 
-                           Command="{Binding Source={x:Reference ThisPage}, Path=Nav.BackButtonCommand}"/>
+                           Command="{Binding Source={x:Reference ThisPage}, Path=Nav.BackButtonCommand}" NumberOfTapsRequired="1"/>
                     </Image.GestureRecognizers>
                     <Image.Behaviors>
                         <toolkit:IconTintColorBehavior TintColor="Red" />
@@ -51,11 +51,11 @@
         </Grid>
     </Shell.TitleView>
 
-    <ContentView.Resources>
+    <ContentPage.Resources>
         <ResourceDictionary>
             <usecase:AuthorsListToStringConverter x:Key="authorsConverter"/>
         </ResourceDictionary>
-    </ContentView.Resources>
+    </ContentPage.Resources>
     
     <ContentPage.Content>
         <ScrollView>
@@ -175,6 +175,9 @@
                         <ColumnDefinition Width="25"/>
                         <ColumnDefinition Width="*"/>
                     </Grid.ColumnDefinitions>
+                    <Grid.GestureRecognizers>
+                        <TapGestureRecognizer Command="{Binding PopUpCommand}" NumberOfTapsRequired="1"/>
+                    </Grid.GestureRecognizers>
                     <Image Grid.Column="0" HeightRequest="25"
                         WidthRequest="25" Source="eyeglasses.svg">
                         <Image.Behaviors>
diff --git a/Sources/BookApp/Pages/EmpruntsPrets.xaml b/Sources/BookApp/Pages/EmpruntsPrets.xaml
index dcf475e..8af46e3 100644
--- a/Sources/BookApp/Pages/EmpruntsPrets.xaml
+++ b/Sources/BookApp/Pages/EmpruntsPrets.xaml
@@ -21,7 +21,7 @@
                 HorizontalOptions="Start">
                     <Image.GestureRecognizers>
                         <TapGestureRecognizer 
-                          Command="{Binding Source={x:Reference ThisPage}, Path=Nav.BackButtonCommand}"/>
+                          Command="{Binding Source={x:Reference ThisPage}, Path=Nav.BackButtonCommand}" NumberOfTapsRequired="1"/>
                     </Image.GestureRecognizers>
                     <Image.Behaviors>
                         <toolkit:IconTintColorBehavior TintColor="Red" />
@@ -70,8 +70,17 @@
             </HorizontalStackLayout>
         </Grid>
     </Shell.TitleView>
-    <StackLayout>
-        <composants:ToggleSwitchView VerticalOptions="Center" HorizontalOptions="Center" />
-        <composants:GroupCollection/>
-    </StackLayout>
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"/>
+            <RowDefinition Height="*"/>
+        </Grid.RowDefinitions>
+        <Rectangle  HeightRequest="1" BackgroundColor="LightGray" VerticalOptions="Start" />
+        <composants:ToggleSwitchView Grid.Row="0" VerticalOptions="Center" HorizontalOptions="Center"/>
+        <Rectangle  HeightRequest="1" BackgroundColor="LightGray" VerticalOptions="End" />
+
+        <ScrollView Grid.Row="1">
+            <composants:GroupCollection/>
+        </ScrollView>
+    </Grid>
 </ContentPage>
\ No newline at end of file
diff --git a/Sources/BookApp/Pages/Filtrage.xaml b/Sources/BookApp/Pages/Filtrage.xaml
index 9ec09b5..9caf503 100644
--- a/Sources/BookApp/Pages/Filtrage.xaml
+++ b/Sources/BookApp/Pages/Filtrage.xaml
@@ -22,7 +22,7 @@
                 HorizontalOptions="Start">
                     <Image.GestureRecognizers>
                         <TapGestureRecognizer 
-                         Command="{Binding Source={x:Reference ThisPage}, Path=Nav.BackButtonCommand}"/>
+                         Command="{Binding Source={x:Reference ThisPage}, Path=Nav.BackButtonCommand}" NumberOfTapsRequired="1"/>
                     </Image.GestureRecognizers>
                     <Image.Behaviors>
                         <toolkit:IconTintColorBehavior TintColor="Red" />
diff --git a/Sources/BookApp/Pages/Tous.xaml b/Sources/BookApp/Pages/Tous.xaml
index 08cc054..0b6cfe7 100644
--- a/Sources/BookApp/Pages/Tous.xaml
+++ b/Sources/BookApp/Pages/Tous.xaml
@@ -22,7 +22,7 @@
                     HorizontalOptions="Start">
                     <Image.GestureRecognizers>
                         <TapGestureRecognizer 
-                            Command="{Binding Source={x:Reference ThisPage}, Path=Nav.BackButtonCommand}"/>
+                            Command="{Binding Source={x:Reference ThisPage}, Path=Nav.BackButtonCommand}" NumberOfTapsRequired="1"/>
                     </Image.GestureRecognizers>
                     <Image.Behaviors>
                         <toolkit:IconTintColorBehavior TintColor="Red" />
diff --git a/Sources/BookApp/ViewModel/ViewModelDetailProvider.cs b/Sources/BookApp/ViewModel/ViewModelDetailProvider.cs
index a553d04..57bcd4c 100644
--- a/Sources/BookApp/ViewModel/ViewModelDetailProvider.cs
+++ b/Sources/BookApp/ViewModel/ViewModelDetailProvider.cs
@@ -1,6 +1,7 @@
 using Model;
 using System.Diagnostics;
 using System.Threading.Tasks;
+using System.Windows.Input;
 using ToolKit;
 using VMWrapper;
 
@@ -37,11 +38,57 @@ namespace BookApp.ViewModel
             }
         }
 
+        // Command Pop-up
+        public ICommand _popUpCommand;
+        public ICommand PopUpCommand =>
+            _popUpCommand ??= new CommandPersonnal(ShowPopUP);
+
         public ViewModelDetailProvider(DetailBookViewModel detailBookViewModel)
         {
             _detailBookViewModel =
                 detailBookViewModel ?? throw new ArgumentNullException(nameof(detailBookViewModel));
         }
+        private async void ShowPopUP()
+        {
+            string action = await DisplayActionSheet("Quel est le statut du livre ?", "Cancel", null, "Finished", "Reading", "NotRead", "ToBeRead");
+            switch (action)
+            {
+                case "Finished":
+                    BookDetail.Status = Status.Finished;
+                    OnPropertyChanged(nameof(BookDetail));
+                    _detailBookViewModel.UpdateColleciton();
+                    break;
+
+                case "Reading":
+                    BookDetail.Status = Status.Reading;
+                    OnPropertyChanged(nameof(BookDetail));
+                    _detailBookViewModel.UpdateColleciton();
+                    break;
+
+                case "NotRead":
+                    BookDetail.Status = Status.NotRead;
+                    OnPropertyChanged(nameof(BookDetail));
+                    _detailBookViewModel.UpdateColleciton();
+                    break;
+
+                case "ToBeRead":
+                    BookDetail.Status = Status.ToBeRead;
+                    OnPropertyChanged(nameof(BookDetail));
+                    _detailBookViewModel.UpdateColleciton();
+                    break;
+
+                default:
+                    BookDetail.Status = Status.Unknown;
+                    OnPropertyChanged(nameof(BookDetail));
+                    break;
+
+            }
+        }
+
+        public async Task<string> DisplayActionSheet(string title, string cancel, string destruction, params string[] buttons)
+        {
+            return await Application.Current.MainPage.DisplayActionSheet(title, cancel, destruction, buttons);
+        }
 
         private async void LoadBookDetailAsync(string bookId)
         {
diff --git a/Sources/BookApp/ViewModel/ViewModelMenu.cs b/Sources/BookApp/ViewModel/ViewModelMenu.cs
index 020d2bf..bd1850b 100644
--- a/Sources/BookApp/ViewModel/ViewModelMenu.cs
+++ b/Sources/BookApp/ViewModel/ViewModelMenu.cs
@@ -1,4 +1,5 @@
 using System.Collections.ObjectModel;
+using VMWrapper;
 
 namespace BookApp.ViewModel
 {
@@ -7,39 +8,39 @@ namespace BookApp.ViewModel
         public ObservableCollection<ViewModelMenuItem> MenuItemsLivre { get; set; }
         public ObservableCollection<ViewModelMenuItem> MenuItemsFiltre { get; set; }
 
-        public ViewModelMenu()
+        public ViewModelMenu(BooksViewModel booksViewModel)
         {
             MenuItemsLivre = new ObservableCollection<ViewModelMenuItem>()
             {
                 new ViewModelMenuItem(
                     "Tous",
                     "../Resources/Images/tray_2_fill.svg",
-                    250,
+                    booksViewModel.TotalBooks,
                     "TousPage"
                 ),
                 new ViewModelMenuItem(
                     "En prêt",
                     "../Resources/Images/person_badge_clock_fill.svg",
-                    250,
+                    null,
                     "EmpruntsPretsPage"
                 ),
                 new ViewModelMenuItem(
                     "À lire plus tard",
                     "../Resources/Images/arrow_forward.svg",
-                    250,
+                    null,
                     ""
                 ),
                 new ViewModelMenuItem(
                     "Statut de lecture",
                     "../Resources/Images/eyeglasses.svg",
-                    250,
+                    null,
                     ""
                 ),
-                new ViewModelMenuItem("Favoris", "../Resources/Images/heart_fill.svg", 250, ""),
+                new ViewModelMenuItem("Favoris", "../Resources/Images/heart_fill.svg", null, ""),
                 new ViewModelMenuItem(
                     "Étiquettes",
                     "../Resources/Images/tag_fill.svg",
-                    250,
+                    null,
                     "",
                     true
                 ),
@@ -50,16 +51,16 @@ namespace BookApp.ViewModel
                 new ViewModelMenuItem(
                     "Auteur",
                     "../Resources/Images/person_fill.svg",
-                    250,
+                    booksViewModel.TotalAuthors,
                     "FiltragePage"
                 ),
                 new ViewModelMenuItem(
                     "Date de publication",
                     "../Resources/Images/calendar.svg",
-                    250,
+                    null,
                     "FiltragePage"
                 ),
-                new ViewModelMenuItem("Note", "../Resources/Images/sparkles.svg", 250, "", true),
+                new ViewModelMenuItem("Note", "../Resources/Images/sparkles.svg", null, "", true),
             };
         }
     }
diff --git a/Sources/BookApp/ViewModel/ViewModelMenuItem.cs b/Sources/BookApp/ViewModel/ViewModelMenuItem.cs
index 3040cd4..c26a265 100644
--- a/Sources/BookApp/ViewModel/ViewModelMenuItem.cs
+++ b/Sources/BookApp/ViewModel/ViewModelMenuItem.cs
@@ -10,14 +10,14 @@ namespace BookApp.ViewModel
     {
         public string Name { get; set; }
         public string Icone { get; set; }
-        public int Number { get; set; }
+        public long? Number { get; set; }
         public string Route { get; set; }
         public bool IsLastItem { get; set; }
 
         public ViewModelMenuItem(
             string name,
             string icone,
-            int number,
+            long? number,
             string route,
             bool isLastItem = false
         )
diff --git a/Sources/Stub/UserLibraryStub.cs b/Sources/Stub/UserLibraryStub.cs
index 4297942..4a2c8cd 100644
--- a/Sources/Stub/UserLibraryStub.cs
+++ b/Sources/Stub/UserLibraryStub.cs
@@ -4,6 +4,7 @@ using Model;
 using System.Linq;
 using LibraryDTO;
 using System.Xml.Linq;
+using System.Diagnostics;
 
 namespace StubLib
 {
diff --git a/Sources/ToolKit/ObservableBook.cs b/Sources/ToolKit/ObservableBook.cs
new file mode 100644
index 0000000..aee0fe8
--- /dev/null
+++ b/Sources/ToolKit/ObservableBook.cs
@@ -0,0 +1,239 @@
+using Model;
+using System.Collections.ObjectModel;
+
+namespace ToolKit
+{
+    public class ObservableBook : BaseViewModel
+    {
+
+        private Book _book;
+        public Book Book
+        {
+            get { return _book; }
+            set
+            {
+                if (_book != value)
+                {
+                    _book = value;
+                    OnPropertyChanged(nameof(Book));
+                }
+            }
+        }
+
+        public ObservableBook(Book book)
+        {
+            _book = book;
+        }
+
+        public string Id
+        {
+            get => _book.Id;
+            set
+            {
+                if (_book.Id != value)
+                {
+                    _book.Id = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+
+        public string Title
+        {
+            get => _book.Title;
+            set
+            {
+                if (_book.Title != value)
+                {
+                    _book.Title = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+
+        public DateTime PublishDate
+        {
+            get => _book.PublishDate;
+            set
+            {
+                if (_book.PublishDate != value)
+                {
+                    _book.PublishDate = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+
+        public List<string> Publishers
+        {
+            get => _book.Publishers;
+            set
+            {
+                if (_book.Publishers != value)
+                {
+                    _book.Publishers = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+
+        public string ISBN13
+        {
+            get => _book.ISBN13;
+            set
+            {
+                if (_book.ISBN13 != value)
+                {
+                    _book.ISBN13 = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+
+        public List<string> Series
+        {
+            get => _book.Series;
+            set
+            {
+                if (_book.Series != value)
+                {
+                    _book.Series = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+
+        public int NbPages
+        {
+            get => _book.NbPages;
+            set
+            {
+                if (_book.NbPages != value)
+                {
+                    _book.NbPages = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+
+        public string Format
+        {
+            get => _book.Format;
+            set
+            {
+                if (_book.Format != value)
+                {
+                    _book.Format = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+
+        public Languages Language 
+        {
+            get => _book.Language;
+            set
+            {
+                if (_book.Language != value)
+                {
+                    _book.Language = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+
+        public List<Contributor> Contributors 
+        {
+            get => _book.Contributors;
+            set
+            {
+                if (_book.Contributors != value)
+                {
+                    _book.Contributors = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+        public string ImageSmall => _book.ImageSmall;
+        public string ImageMedium => _book.ImageMedium;
+        public string ImageLarge => _book.ImageLarge;
+
+        public List<Work> Works
+        {
+            get => _book.Works;
+            set
+            {
+                if (_book.Works != value)
+                {
+                    _book.Works = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+
+        public List<Author> Authors
+        {
+            get => _book.Authors;
+            set
+            {
+                if (_book.Authors != value)
+                {
+                    _book.Authors = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+
+        public Status Status 
+        {
+            get => _book.Status;
+            set
+            {
+                if (_book.Status != value)
+                {
+                    _book.Status = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+
+        public List<string> UserTags
+        {
+            get => _book.UserTags;
+            set
+            {
+                if (_book.UserTags != value)
+                {
+                    _book.UserTags = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+
+        public float? UserRating
+        {
+            get => _book.UserRating;
+            set
+            {
+                if (_book.UserRating != value)
+                {
+                    _book.UserRating = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+
+        public string UserNote
+        {
+            get => _book.UserNote;
+            set
+            {
+                if (_book.UserNote != value)
+                {
+                    _book.UserNote = value;
+                    OnPropertyChanged();
+                }
+            }
+        }
+    }
+}
diff --git a/Sources/ToolKit/ToolKit.csproj b/Sources/ToolKit/ToolKit.csproj
index 4658cbf..a96dc3f 100644
--- a/Sources/ToolKit/ToolKit.csproj
+++ b/Sources/ToolKit/ToolKit.csproj
@@ -6,4 +6,8 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="..\Model\Model.csproj" />
+  </ItemGroup>
+
 </Project>
diff --git a/Sources/VMWrapper/BooksViewModel.cs b/Sources/VMWrapper/BooksViewModel.cs
index ded476a..3a506a7 100644
--- a/Sources/VMWrapper/BooksViewModel.cs
+++ b/Sources/VMWrapper/BooksViewModel.cs
@@ -1,37 +1,75 @@
 using Model;
 using System.Collections.ObjectModel;
+using System.ComponentModel;
+using System.Diagnostics;
+using System.Windows.Input;
+using ToolKit;
 
 namespace VMWrapper
 {
-    public class BooksViewModel
+    public class BooksViewModel: BaseViewModel
     {
         private readonly ILibraryManager data;
+        private readonly IUserLibraryManager userLibraryManager;
 
-        public ObservableCollection<AuteurGroup> AuteurGroups { get; private set; } =
-            new ObservableCollection<AuteurGroup>();
+        private long _totalBooks;
+        public long TotalBooks
+        {
+            get { return _totalBooks; }
+            set
+            {
+                _totalBooks = value;
+                OnPropertyChanged();
+            }
+        }
+
+        private long _totalAuthors;
+        public long TotalAuthors
+        {
+            get { return _totalAuthors; }
+            set
+            {
+                _totalAuthors = value;
+                OnPropertyChanged();
+            }
+        }
 
-        public BooksViewModel(ILibraryManager data)
+        public ObservableCollection<AuteurGroup> AuteurGroups { get; set; }
+
+        private ICommand _removeBookCommand;
+        public ICommand RemoveBookCommand =>
+            _removeBookCommand ??= new CommandPersonnal<string>(
+                async (bookId) => await RemoveBookById(bookId)
+            );
+
+        public BooksViewModel(ILibraryManager data, IUserLibraryManager userLibraryManager)
         {
             this.data = data;
+            this.userLibraryManager = userLibraryManager;
+            AuteurGroups = new ObservableCollection<AuteurGroup>();
             LoadBooksAsync();
         }
 
-        private async void LoadBooksAsync()
+        public async Task LoadBooksAsync()
         {
             try
             {
                 var (totalA, authors) = await data.GetAuthorsByName("", 0, 5);
+                TotalAuthors = totalA;
 
                 foreach (Author author in authors)
                 {
-                    var books = data.GetBooksByAuthor(author.Name, 0, 5).Result.Item2;
+                    var (totalB, books) = data.GetBooksByAuthor(author.Name, 0, 5).Result;
+                    TotalBooks += totalB;
+
                     var observableBooks = new ObservableCollection<Book>(books);
                     AuteurGroups.Add(new AuteurGroup(author.Name, observableBooks));
+
                 }
             }
             catch (Exception ex)
             {
-                System.Diagnostics.Debug.WriteLine(ex.Message);
+                Debug.WriteLine(ex.Message);
             }
         }
 
@@ -45,5 +83,29 @@ namespace VMWrapper
                 Name = name;
             }
         }
+
+
+        public async Task RemoveBookById(string bookId)
+        {
+            await userLibraryManager.RemoveBook(bookId);
+
+            for (int i = AuteurGroups.Count - 1; i >= 0; i--)
+            {
+                var group = AuteurGroups[i];
+                var bookToRemove = group.FirstOrDefault(book => book.Id == bookId);
+                if (bookToRemove != null)
+                {
+                    group.Remove(bookToRemove);
+                    if (group.Count == 0)
+                    {
+                        AuteurGroups.RemoveAt(i);
+                    }
+                    break; 
+                }
+            }
+            OnPropertyChanged(nameof(AuteurGroups));
+        }
+      
+
     }
 }
diff --git a/Sources/VMWrapper/DetailBookViewModel.cs b/Sources/VMWrapper/DetailBookViewModel.cs
index 3b726d9..97bbccf 100644
--- a/Sources/VMWrapper/DetailBookViewModel.cs
+++ b/Sources/VMWrapper/DetailBookViewModel.cs
@@ -8,11 +8,19 @@ namespace VMWrapper
     {
         private readonly ILibraryManager data;
 
+        private readonly IUserLibraryManager userLibraryManager;
+
         public Book BookDetail { get; private set; } = new Book();
 
-        public DetailBookViewModel(ILibraryManager data)
+        public DetailBookViewModel(ILibraryManager data, IUserLibraryManager userLibraryManager)
         {
             this.data = data;
+            this.userLibraryManager = userLibraryManager;
+        }
+
+        public async void UpdateColleciton()
+        {
+            await userLibraryManager.UpdateBook(BookDetail);
         }
 
         public async Task LoadBookDetail(string idBook)
diff --git a/Sources/VMWrapper/Platforms/Android/PlatformClass1.cs b/Sources/VMWrapper/Platforms/Android/PlatformClass1.cs
deleted file mode 100644
index 8d0bdee..0000000
--- a/Sources/VMWrapper/Platforms/Android/PlatformClass1.cs
+++ /dev/null
@@ -1,5 +0,0 @@
-namespace VMWrapper
-{
-    // All the code in this file is only included on Android.
-    public class PlatformClass1 { }
-}
diff --git a/Sources/VMWrapper/Platforms/MacCatalyst/PlatformClass1.cs b/Sources/VMWrapper/Platforms/MacCatalyst/PlatformClass1.cs
deleted file mode 100644
index a52764f..0000000
--- a/Sources/VMWrapper/Platforms/MacCatalyst/PlatformClass1.cs
+++ /dev/null
@@ -1,5 +0,0 @@
-namespace VMWrapper
-{
-    // All the code in this file is only included on Mac Catalyst.
-    public class PlatformClass1 { }
-}
diff --git a/Sources/VMWrapper/Platforms/Tizen/PlatformClass1.cs b/Sources/VMWrapper/Platforms/Tizen/PlatformClass1.cs
deleted file mode 100644
index 4887e66..0000000
--- a/Sources/VMWrapper/Platforms/Tizen/PlatformClass1.cs
+++ /dev/null
@@ -1,7 +0,0 @@
-using System;
-
-namespace VMWrapper
-{
-    // All the code in this file is only included on Tizen.
-    public class PlatformClass1 { }
-}
diff --git a/Sources/VMWrapper/Platforms/Windows/PlatformClass1.cs b/Sources/VMWrapper/Platforms/Windows/PlatformClass1.cs
deleted file mode 100644
index ccc4f60..0000000
--- a/Sources/VMWrapper/Platforms/Windows/PlatformClass1.cs
+++ /dev/null
@@ -1,5 +0,0 @@
-namespace VMWrapper
-{
-    // All the code in this file is only included on Windows.
-    public class PlatformClass1 { }
-}
diff --git a/Sources/VMWrapper/Platforms/iOS/PlatformClass1.cs b/Sources/VMWrapper/Platforms/iOS/PlatformClass1.cs
deleted file mode 100644
index 3f9414a..0000000
--- a/Sources/VMWrapper/Platforms/iOS/PlatformClass1.cs
+++ /dev/null
@@ -1,5 +0,0 @@
-namespace VMWrapper
-{
-    // All the code in this file is only included on iOS.
-    public class PlatformClass1 { }
-}
diff --git a/Sources/VMWrapper/VMWrapper.csproj b/Sources/VMWrapper/VMWrapper.csproj
index 212ee5e..dba2690 100644
--- a/Sources/VMWrapper/VMWrapper.csproj
+++ b/Sources/VMWrapper/VMWrapper.csproj
@@ -1,20 +1,9 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
 	<PropertyGroup>
-		<TargetFrameworks>net7.0;net7.0-android;net7.0-ios;net7.0-maccatalyst</TargetFrameworks>
-		<TargetFrameworks Condition="$([MSBuild]::IsOSPlatform('windows'))">$(TargetFrameworks);net7.0-windows10.0.19041.0</TargetFrameworks>
-		<!-- Uncomment to also build the tizen app. You will need to install tizen by following this: https://github.com/Samsung/Tizen.NET -->
-		<!-- <TargetFrameworks>$(TargetFrameworks);net7.0-tizen</TargetFrameworks> -->
-		<UseMaui>true</UseMaui>
-		<SingleProject>true</SingleProject>
+		<TargetFramework>net7.0</TargetFramework>
 		<ImplicitUsings>enable</ImplicitUsings>
-
-		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'ios'">14.2</SupportedOSPlatformVersion>
-		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'maccatalyst'">14.0</SupportedOSPlatformVersion>
-		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'android'">21.0</SupportedOSPlatformVersion>
-		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</SupportedOSPlatformVersion>
-		<TargetPlatformMinVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">10.0.17763.0</TargetPlatformMinVersion>
-		<SupportedOSPlatformVersion Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'tizen'">6.5</SupportedOSPlatformVersion>
+		<Nullable>enable</Nullable>
 	</PropertyGroup>
 
 	<ItemGroup>