Drawer korrigiert, Gruppenanlegen optimiert.

LehrerApp.Desktop/App.axaml.cs

@@ -33,7 +33,7 @@ public class App : Application
     {
         // GroupList → GroupDetail
         var gl = Services.GetRequiredService<GroupListViewModel>();
-        gl.OnNavigateToDetail = id => main.NavigateToGroupDetail(id);
+        gl.OnNavigateToDetail = (id, tab) => main.NavigateToGroupDetail(id, tab);
         gl.OnAddGroup         = () => ShowAddGroupDialog(gl);
 
         // Dashboard → GroupDetail (Chips)

LehrerApp.Desktop/ViewModels/Groups/GroupViewModels.cs

@@ -14,7 +14,7 @@ public partial class GroupListViewModel : ObservableObject
     private readonly IGroupRepository _groups;
     private readonly SchoolYearService _sy;
 
-    public Action<Guid>? OnNavigateToDetail { get; set; }
+    public Action<Guid, int>? OnNavigateToDetail { get; set; }
     public Action? OnAddGroup { get; set; }
 
     [ObservableProperty] private string _selectedSchoolYear = "";
@@ -33,10 +33,8 @@ public partial class GroupListViewModel : ObservableObject
 
     partial void OnSelectedSchoolYearChanged(string value) => LoadGroups();
     partial void OnSearchTextChanged(string value)          => LoadGroups();
-    partial void OnSelectedGroupChanged(GroupListItem? value)
-    {
-        if (value is not null) OnNavigateToDetail?.Invoke(value.Id);
-    }
+    partial void OnSelectedGroupChanged(GroupListItem? value) =>
+        NavigateToSectionCommand.NotifyCanExecuteChanged();
 
     public void LoadGroups()
     {
@@ -51,6 +49,15 @@ public partial class GroupListViewModel : ObservableObject
 
     [RelayCommand] private void AddGroup() => OnAddGroup?.Invoke();
     [RelayCommand] private void Refresh()   => LoadGroups();
+
+    [RelayCommand(CanExecute = nameof(HasSelectedGroup))]
+    private void NavigateToSection(string? tabIndex)
+    {
+        if (SelectedGroup is null || !int.TryParse(tabIndex, out var tab)) return;
+        OnNavigateToDetail?.Invoke(SelectedGroup.Id, tab);
+    }
+
+    private bool HasSelectedGroup() => SelectedGroup is not null;
 }
 
 public class GroupListItem
@@ -61,6 +68,7 @@ public class GroupListItem
     public string DisplayName { get; }
     public string TypeLabel { get; }
     public string GradingLabel { get; }
+    public string Subtitle { get; }
 
     public GroupListItem(LearningGroup g)
     {
@@ -69,7 +77,8 @@ public class GroupListItem
         Subject      = g.Subject ?? "";
         TypeLabel    = g.Type == GroupType.Class ? "Klasse" : "Kurs";
         GradingLabel = g.GradingSystem == GradingSystem.Grades1To6 ? "1–6" : "0–15";
-        DisplayName  = string.IsNullOrEmpty(Subject) ? Name : $"{Name} · {Subject}";
+        DisplayName  = string.IsNullOrEmpty(g.Subject) ? g.Name : $"{g.Name} · {g.Subject}";
+        Subtitle     = $"{TypeLabel} · Stufe {g.GradeLevel} · Noten {GradingLabel} · {g.SchoolYear}";
     }
 }
 
@@ -86,6 +95,7 @@ public partial class GroupDetailViewModel : ObservableObject
     [ObservableProperty] private string _groupTitle = "";
     [ObservableProperty] private string _groupSubtitle = "";
     [ObservableProperty] private int _studentCount;
+    [ObservableProperty] private int _activeTabIndex = 0;
 
     public ObservableCollection<StudentSummary> Students { get; } = [];
     public ObservableCollection<ExamSummary> Exams { get; } = [];
@@ -153,6 +163,20 @@ public partial class AddGroupDialogViewModel : ObservableObject
     private readonly IGroupRepository _groups;
     private readonly SchoolYearService _sy;
 
+    public List<string> TypeOptions { get; } = ["Klasse", "Kurs"];
+    [ObservableProperty] private string _selectedTypeName = "Kurs";
+
+    public bool IsKurs       => SelectedTypeName == "Kurs";
+    public string NameLabel  => IsKurs ? "Kursname *" : "Klassenname *";
+    public string NameHint   => IsKurs ? "z.B. Q1, LK, GK" : "z.B. 10E, 5a, 11b";
+
+    partial void OnSelectedTypeNameChanged(string value)
+    {
+        OnPropertyChanged(nameof(IsKurs));
+        OnPropertyChanged(nameof(NameLabel));
+        OnPropertyChanged(nameof(NameHint));
+    }
+
     [ObservableProperty] private string _name = "";
     [ObservableProperty] private string _subject = "";
     [ObservableProperty] private int _gradeLevel = 10;
@@ -168,7 +192,6 @@ public partial class AddGroupDialogViewModel : ObservableObject
         _groups = groups; _sy = sy;
         SchoolYears        = sy.RecentSchoolYears(3);
         SelectedSchoolYear = sy.CurrentSchoolYear();
-        // Notensystem automatisch nach Klassenstufe
         PropertyChanged += (_, e) =>
         {
             if (e.PropertyName == nameof(GradeLevel))
@@ -180,13 +203,13 @@ public partial class AddGroupDialogViewModel : ObservableObject
     [RelayCommand]
     private void Save()
     {
-        if (string.IsNullOrWhiteSpace(Name)) { ValidationMessage = "Name erforderlich."; return; }
+        if (string.IsNullOrWhiteSpace(Name)) { ValidationMessage = "Bezeichnung erforderlich."; return; }
         if (GradeLevel is < 1 or > 13)       { ValidationMessage = "Klassenstufe 1–13."; return; }
         Result = new LearningGroup
         {
             Name          = Name.Trim(),
-            Subject       = string.IsNullOrWhiteSpace(Subject) ? null : Subject.Trim(),
-            Type          = GroupType.Course,
+            Subject       = IsKurs && !string.IsNullOrWhiteSpace(Subject) ? Subject.Trim() : null,
+            Type          = IsKurs ? GroupType.Course : GroupType.Class,
             GradeLevel    = GradeLevel,
             GradingSystem = GradingSystem,
             SchoolYear    = SelectedSchoolYear,

LehrerApp.Desktop/ViewModels/MainWindowViewModel.cs

@@ -40,11 +40,12 @@ public partial class MainWindowViewModel : ObservableObject
         };
     }
 
-    public void NavigateToGroupDetail(Guid groupId)
+    public void NavigateToGroupDetail(Guid groupId, int initialTab = 0)
     {
         ActiveNavItem = NavItem.Groups;
         var vm = _services.GetRequiredService<GroupDetailViewModel>();
         vm.LoadGroup(groupId);
+        vm.ActiveTabIndex = initialTab;
         CurrentPage = vm;
     }
 

LehrerApp.Desktop/Views/Groups/AddGroupDialog.axaml

@@ -10,14 +10,27 @@
   <Grid RowDefinitions="*,Auto" Margin="24">
     <StackPanel Grid.Row="0" Spacing="14">
       <TextBlock Text="Neue Lerngruppe anlegen" FontSize="18" FontWeight="SemiBold"/>
+
+      <!-- Typ: Klasse oder Kurs -->
       <StackPanel Spacing="4">
-        <TextBlock Text="Name *" FontSize="12" Opacity="0.7"/>
-        <TextBox Text="{Binding Name}" Watermark="z.B. 10E, Q1 Chemie, 5a"/>
+        <TextBlock Text="Typ *" FontSize="12" Opacity="0.7"/>
+        <ComboBox ItemsSource="{Binding TypeOptions}"
+                  SelectedItem="{Binding SelectedTypeName}"
+                  HorizontalAlignment="Stretch"/>
       </StackPanel>
+
+      <!-- Bezeichnung – Label und Placeholder reagieren auf den Typ -->
       <StackPanel Spacing="4">
-        <TextBlock Text="Fach" FontSize="12" Opacity="0.7"/>
-        <TextBox Text="{Binding Subject}" Watermark="z.B. Chemie, Mathematik"/>
+        <TextBlock Text="{Binding NameLabel}" FontSize="12" Opacity="0.7"/>
+        <TextBox Text="{Binding Name}" PlaceholderText="{Binding NameHint}"/>
       </StackPanel>
+
+      <!-- Fach – nur bei Kurs relevant -->
+      <StackPanel Spacing="4" IsVisible="{Binding IsKurs}">
+        <TextBlock Text="Fach (optional)" FontSize="12" Opacity="0.7"/>
+        <TextBox Text="{Binding Subject}" PlaceholderText="z.B. Chemie, Mathematik"/>
+      </StackPanel>
+
       <Grid ColumnDefinitions="*,12,*">
         <StackPanel Grid.Column="0" Spacing="4">
           <TextBlock Text="Klassenstufe *" FontSize="12" Opacity="0.7"/>
@@ -30,9 +43,11 @@
                     HorizontalAlignment="Stretch"/>
         </StackPanel>
       </Grid>
+
       <TextBlock Text="{Binding ValidationMessage}" Foreground="Red" FontSize="12"
                  IsVisible="{Binding ValidationMessage, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
     </StackPanel>
+
     <Grid Grid.Row="1" ColumnDefinitions="*,8,*" Margin="0,20,0,0">
       <Button Grid.Column="0" Content="Abbrechen" HorizontalAlignment="Stretch" Click="OnCancel"/>
       <Button Grid.Column="2" Content="Anlegen"   HorizontalAlignment="Stretch" Click="OnSave"/>

LehrerApp.Desktop/Views/Groups/GroupDetailView.axaml

@@ -31,7 +31,7 @@
       Kein ActiveTab-Property, kein IsVisible-Binding, keine eigenen Tab-Buttons.
       TabPlacement="Top" → Tabs oben (wie Browser-Tabs).
     -->
-    <TabbedPage Grid.Row="1" TabPlacement="Top">
+    <TabbedPage Grid.Row="1" TabPlacement="Top" SelectedIndex="{Binding ActiveTabIndex}">
 
       <!-- Tab: Übersicht -->
       <ContentPage Header="Übersicht">

LehrerApp.Desktop/Views/Groups/GroupListView.axaml

@@ -5,6 +5,8 @@
              x:DataType="vm:GroupListViewModel">
 
   <Grid RowDefinitions="Auto,*">
+
+    <!-- Kopfzeile mit Schuljahr-Wähler und Neu-Button -->
     <Border Grid.Row="0" Padding="20,16"
             BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
             BorderThickness="0,0,0,1">
@@ -25,39 +27,43 @@
       </Grid>
     </Border>
 
+    <!-- Master-Detail: Liste links, Übersicht rechts -->
     <Grid Grid.Row="1" ColumnDefinitions="260,*">
+
+      <!-- Linke Spalte: Sucheingabe + Listenansicht -->
       <Border Grid.Column="0"
               BorderBrush="{DynamicResource SystemControlForegroundBaseLowBrush}"
               BorderThickness="0,0,1,0">
-      <DockPanel>
-        <TextBox DockPanel.Dock="Top" Text="{Binding SearchText}"
-                 PlaceholderText="Suchen…" Margin="12,8"/>
-        <ListBox ItemsSource="{Binding Groups}"
-                 SelectedItem="{Binding SelectedGroup}">
-          <ListBox.ItemTemplate>
-            <DataTemplate DataType="vm:GroupListItem">
-              <Grid ColumnDefinitions="4,*" Margin="2,4">
-                <Border Grid.Column="0" Width="4" CornerRadius="2"
-                        Background="{DynamicResource SystemAccentColor}"
-                        Margin="0,0,10,0"/>
-                <StackPanel Grid.Column="1">
-                  <Grid ColumnDefinitions="*,Auto">
-                    <TextBlock Grid.Column="0" Text="{Binding Name}"
-                               FontWeight="SemiBold" FontSize="13"/>
-                    <TextBlock Grid.Column="1" Text="{Binding TypeLabel}"
-                               FontSize="11" Opacity="0.5"/>
-                  </Grid>
-                  <TextBlock Text="{Binding Subject}" FontSize="12" Opacity="0.65"
-                             IsVisible="{Binding Subject, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
-                  <TextBlock Text="{Binding GradingLabel}" FontSize="11" Opacity="0.4"/>
-                </StackPanel>
-              </Grid>
-            </DataTemplate>
-          </ListBox.ItemTemplate>
-        </ListBox>
-      </DockPanel>
+        <DockPanel>
+          <TextBox DockPanel.Dock="Top" Text="{Binding SearchText}"
+                   PlaceholderText="Suchen…" Margin="12,8"/>
+          <ListBox ItemsSource="{Binding Groups}"
+                   SelectedItem="{Binding SelectedGroup}">
+            <ListBox.ItemTemplate>
+              <DataTemplate DataType="vm:GroupListItem">
+                <Grid ColumnDefinitions="4,*" Margin="2,4">
+                  <Border Grid.Column="0" Width="4" CornerRadius="2"
+                          Background="{DynamicResource SystemAccentColor}"
+                          Margin="0,0,10,0"/>
+                  <StackPanel Grid.Column="1">
+                    <Grid ColumnDefinitions="*,Auto">
+                      <TextBlock Grid.Column="0" Text="{Binding Name}"
+                                 FontWeight="SemiBold" FontSize="13"/>
+                      <TextBlock Grid.Column="1" Text="{Binding TypeLabel}"
+                                 FontSize="11" Opacity="0.5"/>
+                    </Grid>
+                    <TextBlock Text="{Binding Subject}" FontSize="12" Opacity="0.65"
+                               IsVisible="{Binding Subject, Converter={x:Static StringConverters.IsNotNullOrEmpty}}"/>
+                    <TextBlock Text="{Binding GradingLabel}" FontSize="11" Opacity="0.4"/>
+                  </StackPanel>
+                </Grid>
+              </DataTemplate>
+            </ListBox.ItemTemplate>
+          </ListBox>
+        </DockPanel>
       </Border>
 
+      <!-- Rechte Spalte: Platzhalter wenn keine Auswahl -->
       <StackPanel Grid.Column="1" HorizontalAlignment="Center"
                   VerticalAlignment="Center" Spacing="8"
                   IsVisible="{Binding !SelectedGroup}">
@@ -66,6 +72,55 @@
         <TextBlock Text="oder ＋ Neue Gruppe anlegen" FontSize="12" Opacity="0.3"
                    HorizontalAlignment="Center"/>
       </StackPanel>
+
+      <!-- Rechte Spalte: Gruppen-Übersicht wenn ausgewählt -->
+      <ScrollViewer Grid.Column="1" IsVisible="{Binding SelectedGroup}">
+        <StackPanel Margin="28,24" Spacing="20">
+
+          <!-- Gruppenname und Kurzinfos -->
+          <StackPanel Spacing="4">
+            <TextBlock Text="{Binding SelectedGroup.DisplayName}"
+                       FontSize="24" FontWeight="SemiBold" TextWrapping="Wrap"/>
+            <TextBlock Text="{Binding SelectedGroup.Subtitle}"
+                       FontSize="12" Opacity="0.55"/>
+          </StackPanel>
+
+          <Separator/>
+
+          <!-- Bereichs-Navigation -->
+          <TextBlock Text="BEREICHE" FontSize="10" FontWeight="Bold"
+                     Opacity="0.4" Margin="0,0,0,2"/>
+          <StackPanel Spacing="6">
+            <Button Content="👤  Schülerliste"
+                    HorizontalAlignment="Stretch" HorizontalContentAlignment="Left"
+                    Padding="12,9"
+                    Command="{Binding NavigateToSectionCommand}"
+                    CommandParameter="1"/>
+            <Button Content="📝  Klausuren"
+                    HorizontalAlignment="Stretch" HorizontalContentAlignment="Left"
+                    Padding="12,9"
+                    Command="{Binding NavigateToSectionCommand}"
+                    CommandParameter="2"/>
+            <Button Content="🔢  Notenübersicht"
+                    HorizontalAlignment="Stretch" HorizontalContentAlignment="Left"
+                    Padding="12,9"
+                    Command="{Binding NavigateToSectionCommand}"
+                    CommandParameter="3"/>
+            <Button Content="📅  Unterrichtsplanung"
+                    HorizontalAlignment="Stretch" HorizontalContentAlignment="Left"
+                    Padding="12,9"
+                    Command="{Binding NavigateToSectionCommand}"
+                    CommandParameter="4"/>
+            <Button Content="📋  Dokumentation"
+                    HorizontalAlignment="Stretch" HorizontalContentAlignment="Left"
+                    Padding="12,9"
+                    Command="{Binding NavigateToSectionCommand}"
+                    CommandParameter="5"/>
+          </StackPanel>
+
+        </StackPanel>
+      </ScrollViewer>
+
     </Grid>
   </Grid>
 </UserControl>

LehrerApp.Desktop/Views/MainWindow.axaml

@@ -20,7 +20,31 @@
     Kein eigener Code nötig.
   -->
   <DrawerPage DrawerLength="220"
-              DrawerBehavior="Auto">
+              DrawerBehavior="Auto"
+              DrawerLayoutBehavior="CompactInline"
+              
+              Content="{Binding CurrentPage}">
+
+    <DrawerPage.DataTemplates>
+      <DataTemplate DataType="vm:DashboardViewModel">
+        <vd:DashboardView/>
+      </DataTemplate>
+      <DataTemplate DataType="vmg:GroupListViewModel">
+        <vg:GroupListView/>
+      </DataTemplate>
+      <DataTemplate DataType="vmg:GroupDetailViewModel">
+        <vg:GroupDetailView/>
+      </DataTemplate>
+      <DataTemplate DataType="vms:StudentListViewModel">
+        <vs:StudentListView/>
+      </DataTemplate>
+      <DataTemplate DataType="vms:StudentDetailViewModel">
+        <vs:StudentDetailView/>
+      </DataTemplate>
+      <DataTemplate DataType="vm:PlaceholderViewModel">
+        <views:PlaceholderView/>
+      </DataTemplate>
+    </DrawerPage.DataTemplates>
 
     <DrawerPage.Drawer>
       <DockPanel>
@@ -91,29 +115,5 @@
       </DockPanel>
     </DrawerPage.Drawer>
 
-    <!-- DataTemplates verbinden ViewModels mit ihren Views -->
-    <ContentControl Content="{Binding CurrentPage}">
-      <ContentControl.DataTemplates>
-        <DataTemplate DataType="vm:DashboardViewModel">
-          <vd:DashboardView/>
-        </DataTemplate>
-        <DataTemplate DataType="vmg:GroupListViewModel">
-          <vg:GroupListView/>
-        </DataTemplate>
-        <DataTemplate DataType="vmg:GroupDetailViewModel">
-          <vg:GroupDetailView/>
-        </DataTemplate>
-        <DataTemplate DataType="vms:StudentListViewModel">
-          <vs:StudentListView/>
-        </DataTemplate>
-        <DataTemplate DataType="vms:StudentDetailViewModel">
-          <vs:StudentDetailView/>
-        </DataTemplate>
-        <DataTemplate DataType="vm:PlaceholderViewModel">
-          <views:PlaceholderView/>
-        </DataTemplate>
-      </ContentControl.DataTemplates>
-    </ContentControl>
-
   </DrawerPage>
 </Window>