diff --git a/DaSaSo.Domain/DaSaSo.Domain.csproj b/DaSaSo.Domain/DaSaSo.Domain.csproj
index 4de8048..2b40fef 100644
--- a/DaSaSo.Domain/DaSaSo.Domain.csproj
+++ b/DaSaSo.Domain/DaSaSo.Domain.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFramework>net6.0</TargetFramework>
-    <Nullable>enable</Nullable>
+    <Nullable>disable</Nullable>
   </PropertyGroup>
 
 </Project>
diff --git a/DaSaSo.EntityFramework/Services/ClientDataService.cs b/DaSaSo.EntityFramework/Services/ClientDataService.cs
index 28f4c64..6bc3dd0 100644
--- a/DaSaSo.EntityFramework/Services/ClientDataService.cs
+++ b/DaSaSo.EntityFramework/Services/ClientDataService.cs
@@ -1,5 +1,6 @@
 using DaSaSo.Domain.Model;
 using DaSaSo.Domain.Services;
+using DaSaSo.EntityFramework.Services.Common;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.ChangeTracking;
 using System;
@@ -13,31 +14,22 @@ namespace DaSaSo.EntityFramework.Services
     public class ClientDataService : IDataService<Client>
     {
         private readonly DaSaSoDbContextFactory _contextFactory;
+        private readonly NonQueryDataService<Client> _nonQueryDataService;
 
         public ClientDataService(DaSaSoDbContextFactory contextFactory)
         {
             _contextFactory = contextFactory;
+            _nonQueryDataService = new NonQueryDataService<Client>(contextFactory);
         }
 
         public async Task<Client> Create(Client entity)
         {
-            using (DaSaSoDbContext context = _contextFactory.CreateDbContext())
-            {
-                EntityEntry<Client> createdResult = await context.Set<Client>().AddAsync(entity);
-                await context.SaveChangesAsync();
-                return createdResult.Entity;
-            }
+            return await _nonQueryDataService.Create(entity);
         }
 
         public async Task<bool> Delete(int id)
         {
-            using (DaSaSoDbContext context = _contextFactory.CreateDbContext())
-            {
-                Client entity = await context.Set<Client>().FirstOrDefaultAsync((e) => e.Id == id);
-                context.Set<Client>().Remove(entity);
-                await context.SaveChangesAsync();
-                return true;
-            }
+            return await _nonQueryDataService.Delete(id);
         }
 
         public async Task<Client> Get(int id)
@@ -54,7 +46,7 @@ namespace DaSaSo.EntityFramework.Services
         {
             using (DaSaSoDbContext context = _contextFactory.CreateDbContext())
             {
-                IEnumerable<Client> entities = await context.Set<Client>().ToListAsync();
+                IEnumerable<Client> entities = await context.Clients.ToListAsync();
 
                 return entities;
             }
@@ -62,13 +54,7 @@ namespace DaSaSo.EntityFramework.Services
 
         public async Task<Client> Update(int id, Client entity)
         {
-            using (DaSaSoDbContext context = _contextFactory.CreateDbContext())
-            {
-                entity.Id = id;
-                context.Set<Client>().Update(entity);
-                await context.SaveChangesAsync();
-                return entity;
-            }
+            return await _nonQueryDataService.Update(id, entity);
         }
     }
 }
diff --git a/DaSaSo.EntityFramework/Services/Common/NonQueryDataService.cs b/DaSaSo.EntityFramework/Services/Common/NonQueryDataService.cs
new file mode 100644
index 0000000..b997fae
--- /dev/null
+++ b/DaSaSo.EntityFramework/Services/Common/NonQueryDataService.cs
@@ -0,0 +1,51 @@
+using DaSaSo.Domain.Model;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.ChangeTracking;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.EntityFramework.Services.Common
+{
+    class NonQueryDataService<T> where T: DomainObject
+    {
+        private readonly DaSaSoDbContextFactory _contextFactory;
+
+        public NonQueryDataService(DaSaSoDbContextFactory contextFactory)
+        {
+            _contextFactory = contextFactory;
+        }
+        public async Task<T> Create(T entity)
+        {
+            using (DaSaSoDbContext context = _contextFactory.CreateDbContext())
+            {
+                EntityEntry<T> createdEntity = await context.Set<T>().AddAsync(entity);
+                await context.SaveChangesAsync();
+                return createdEntity.Entity;
+            }
+        }
+
+        public async Task<bool> Delete(int id)
+        {
+            using (DaSaSoDbContext context = _contextFactory.CreateDbContext())
+            {
+                T entity = await context.Set<T>().FirstOrDefaultAsync((e) => e.Id == id);
+                context.Set<T>().Remove(entity);
+                await context.SaveChangesAsync();
+                return true;
+            }
+        }
+        public async Task<T> Update(int id, T entity)
+        {
+            using (DaSaSoDbContext context = _contextFactory.CreateDbContext())
+            {
+                entity.Id = id;
+                context.Set<T>().Update(entity);
+                await context.SaveChangesAsync();
+                return entity;
+            }
+        }
+    }
+}
diff --git a/DaSaSo.EntityFramework/Services/GenericDataService.cs b/DaSaSo.EntityFramework/Services/GenericDataService.cs
index a0af62c..4b7f251 100644
--- a/DaSaSo.EntityFramework/Services/GenericDataService.cs
+++ b/DaSaSo.EntityFramework/Services/GenericDataService.cs
@@ -1,5 +1,6 @@
 using DaSaSo.Domain.Model;
 using DaSaSo.Domain.Services;
+using DaSaSo.EntityFramework.Services.Common;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.ChangeTracking;
 using System;
@@ -13,31 +14,22 @@ namespace DaSaSo.EntityFramework.Services
     public class GenericDataService<T> : IDataService<T> where T : DomainObject
     {
         private readonly DaSaSoDbContextFactory _contextFactory;
+        private readonly NonQueryDataService<T> _nonQueryDataService;
 
         public GenericDataService(DaSaSoDbContextFactory contextFactory)
         {
             this._contextFactory = contextFactory;
+            _nonQueryDataService = new NonQueryDataService<T>(contextFactory);
         }
 
         public async Task<T> Create(T entity)
         {
-            using (DaSaSoDbContext context = _contextFactory.CreateDbContext())
-            {
-                EntityEntry<T> createdEntity = await context.Set<T>().AddAsync(entity);
-                await context.SaveChangesAsync();
-                return createdEntity.Entity;
-            }
+            return await _nonQueryDataService.Create(entity);
         }
 
         public async Task<bool> Delete(int id)
         {
-            using (DaSaSoDbContext context = _contextFactory.CreateDbContext())
-            {
-                T entity = await context.Set<T>().FirstOrDefaultAsync((e) => e.Id == id);
-                context.Set<T>().Remove(entity);
-                await context.SaveChangesAsync();
-                return true;
-            }
+            return await _nonQueryDataService.Delete(id);
         }
 
         public async Task<T> Get(int id)
@@ -62,13 +54,7 @@ namespace DaSaSo.EntityFramework.Services
 
         public async Task<T> Update(int id, T entity)
         {
-            using (DaSaSoDbContext context = _contextFactory.CreateDbContext())
-            {
-                entity.Id = id;
-                context.Set<T>().Update(entity);
-                await context.SaveChangesAsync();
-                return entity;
-            }
+            return await _nonQueryDataService.Update(id, entity);
         }
     }
 }
diff --git a/DaSaSo.ViewModel/ClientListViewModel.cs b/DaSaSo.ViewModel/ClientListViewModel.cs
index ea6241e..1f2b626 100644
--- a/DaSaSo.ViewModel/ClientListViewModel.cs
+++ b/DaSaSo.ViewModel/ClientListViewModel.cs
@@ -58,7 +58,7 @@ namespace DaSaSo.ViewModel
             _dataService = dataService;
             
             
-            //LoadClient();
+            LoadClient();
             SelectClientCommand = new RelayCommand(SelectClient, () => SelectedClient != null);
             EditClientCommand = new RelayCommand(EditClient, () => SelectedClient != null);
             AddNewClientCommand = new RelayCommand(AddNewClient);
diff --git a/DaSaSo.ViewModel/Commands/UpdateCurrentViewModelCommand.cs b/DaSaSo.ViewModel/Commands/UpdateCurrentViewModelCommand.cs
new file mode 100644
index 0000000..5c55c34
--- /dev/null
+++ b/DaSaSo.ViewModel/Commands/UpdateCurrentViewModelCommand.cs
@@ -0,0 +1,33 @@
+using DaSaSo.ViewModel.Enums;
+using DaSaSo.ViewModel.Interface;
+using System.Windows.Input;
+
+namespace DaSaSo.ViewModel.Commands
+{
+    class UpdateCurrentViewModelCommand : ICommand
+    {
+        public event EventHandler? CanExecuteChanged;
+        private INavigator _navigator;
+        private readonly IViewModelAbstractFactory _viewModelFactory;
+
+        public UpdateCurrentViewModelCommand(INavigator navigator, IViewModelAbstractFactory viewModelFactory)
+        {
+            _navigator = navigator;
+            _viewModelFactory = viewModelFactory;
+        }
+
+        public bool CanExecute(object? parameter)
+        {
+            return true;
+        }
+
+        public void Execute(object? parameter)
+        {
+            if(parameter is EViewType)
+            {
+                EViewType viewType = (EViewType)parameter;
+                _navigator.CurrentViewModel = _viewModelFactory.CreateViewModel(viewType);
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/DaSaSo.ViewModel/Enums/EViewType.cs b/DaSaSo.ViewModel/Enums/EViewType.cs
new file mode 100644
index 0000000..87de7db
--- /dev/null
+++ b/DaSaSo.ViewModel/Enums/EViewType.cs
@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.ViewModel.Enums
+{
+    public enum EViewType
+    {
+        Home,
+        Clients,
+        Projects,
+        Buildingsites,
+        SewerObjects
+    }
+}
diff --git a/DaSaSo.ViewModel/Factories/ClientListViewModelFactory.cs b/DaSaSo.ViewModel/Factories/ClientListViewModelFactory.cs
new file mode 100644
index 0000000..129fe91
--- /dev/null
+++ b/DaSaSo.ViewModel/Factories/ClientListViewModelFactory.cs
@@ -0,0 +1,20 @@
+using DaSaSo.Domain.Model;
+using DaSaSo.EntityFramework;
+using DaSaSo.EntityFramework.Services;
+using DaSaSo.ViewModel.Interface;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.ViewModel.Factories
+{
+    public class ClientListViewModelFactory : IViewModelFactory<ClientListViewModel>
+    {
+        public ClientListViewModel CreateViewModel()
+        {
+            return new ClientListViewModel(new GenericDataService<Client>(new DaSaSoDbContextFactory()));
+        }
+    }
+}
diff --git a/DaSaSo.ViewModel/Factories/HomeViewModelFactory.cs b/DaSaSo.ViewModel/Factories/HomeViewModelFactory.cs
new file mode 100644
index 0000000..7f8b4f1
--- /dev/null
+++ b/DaSaSo.ViewModel/Factories/HomeViewModelFactory.cs
@@ -0,0 +1,17 @@
+using DaSaSo.ViewModel.Interface;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.ViewModel.Factories
+{
+    public class HomeViewModelFactory : IViewModelFactory<HomeViewModel>
+    {
+        public HomeViewModel CreateViewModel()
+        {
+            return new HomeViewModel();
+        }
+    }
+}
diff --git a/DaSaSo.ViewModel/Factories/ViewModelAbstractFactory.cs b/DaSaSo.ViewModel/Factories/ViewModelAbstractFactory.cs
new file mode 100644
index 0000000..d9d3cac
--- /dev/null
+++ b/DaSaSo.ViewModel/Factories/ViewModelAbstractFactory.cs
@@ -0,0 +1,46 @@
+using DaSaSo.Domain.Model;
+using DaSaSo.EntityFramework;
+using DaSaSo.EntityFramework.Services;
+using DaSaSo.ViewModel.Enums;
+using DaSaSo.ViewModel.Interface;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.ViewModel.Factories
+{
+    public class ViewModelAbstractFactory : IViewModelAbstractFactory
+    {
+        private IViewModelFactory<HomeViewModel> _homeViewModelFactory;
+        private IViewModelFactory<ClientListViewModel> _clientListViewModel;
+
+        public ViewModelAbstractFactory(IViewModelFactory<HomeViewModel> homeViewModelFactory, IViewModelFactory<ClientListViewModel> clientListViewModel)
+        {
+            _homeViewModelFactory = homeViewModelFactory;
+            _clientListViewModel = clientListViewModel;
+        }
+
+        public BaseViewModel CreateViewModel(EViewType viewType)
+        {
+            
+            switch (viewType)
+            {
+                case EViewType.Home:
+                    return _homeViewModelFactory.CreateViewModel(); 
+                case EViewType.Clients:
+                    return _clientListViewModel.CreateViewModel();
+                /*case EViewType.Projects:
+                    break;
+                case EViewType.Buildingsites:
+                    break;
+                case EViewType.SewerObjects:
+                    break;
+                */
+                default:
+                    throw new ArgumentException("The Viewtype dos not have a ViewModel.", "viewType");
+            }
+        }
+    }
+}
diff --git a/DaSaSo.ViewModel/HomeViewModel.cs b/DaSaSo.ViewModel/HomeViewModel.cs
new file mode 100644
index 0000000..e1573d8
--- /dev/null
+++ b/DaSaSo.ViewModel/HomeViewModel.cs
@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.ViewModel
+{
+    public class HomeViewModel : BaseViewModel
+    {
+        public string Welcome { get => "Herzlich willkommen"; }
+    }
+}
diff --git a/DaSaSo.ViewModel/Interface/INavigator.cs b/DaSaSo.ViewModel/Interface/INavigator.cs
new file mode 100644
index 0000000..7c4f1f2
--- /dev/null
+++ b/DaSaSo.ViewModel/Interface/INavigator.cs
@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+
+namespace DaSaSo.ViewModel.Interface
+{
+    public interface INavigator
+    {
+        BaseViewModel CurrentViewModel { get; set; }
+        ICommand UpdateViewModelCommand { get; }
+    }
+}
diff --git a/DaSaSo.ViewModel/Interface/IViewModelAbstractFactory.cs b/DaSaSo.ViewModel/Interface/IViewModelAbstractFactory.cs
new file mode 100644
index 0000000..d88466f
--- /dev/null
+++ b/DaSaSo.ViewModel/Interface/IViewModelAbstractFactory.cs
@@ -0,0 +1,14 @@
+using DaSaSo.ViewModel.Enums;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.ViewModel.Interface
+{
+    public interface IViewModelAbstractFactory
+    {
+        BaseViewModel CreateViewModel(EViewType viewType);
+    }
+}
diff --git a/DaSaSo.ViewModel/Interface/IViewModelFactory.cs b/DaSaSo.ViewModel/Interface/IViewModelFactory.cs
new file mode 100644
index 0000000..e359657
--- /dev/null
+++ b/DaSaSo.ViewModel/Interface/IViewModelFactory.cs
@@ -0,0 +1,13 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DaSaSo.ViewModel.Interface
+{
+    public interface IViewModelFactory<T> where T: BaseViewModel
+    {
+        T CreateViewModel();
+    }
+}
diff --git a/DaSaSo.ViewModel/State/Navigation/Navigator.cs b/DaSaSo.ViewModel/State/Navigation/Navigator.cs
new file mode 100644
index 0000000..cde24ea
--- /dev/null
+++ b/DaSaSo.ViewModel/State/Navigation/Navigator.cs
@@ -0,0 +1,35 @@
+using DaSaSo.ViewModel.Commands;
+using DaSaSo.ViewModel.Interface;
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+using System.Windows.Input;
+
+namespace DaSaSo.ViewModel.State.Navigation
+{
+    public class Navigator : INavigator, INotifyPropertyChanged
+    {
+        public event PropertyChangedEventHandler? PropertyChanged;
+        private BaseViewModel _currentViewModel;
+        public BaseViewModel CurrentViewModel
+        {
+            get => _currentViewModel;
+            set
+            {
+                _currentViewModel = value;
+                OnPropertyChanged();
+            }
+        }
+
+        public ICommand UpdateViewModelCommand { get; set; }
+
+        public Navigator(IViewModelAbstractFactory viewModelFactory)
+        {
+            UpdateViewModelCommand = new UpdateCurrentViewModelCommand(this, viewModelFactory);
+        }
+
+        protected void OnPropertyChanged([CallerMemberName]string propertyName = null)
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+    }
+}
diff --git a/DaSaSo.ViewModel/Window/MainWindowViewModel.cs b/DaSaSo.ViewModel/Window/MainWindowViewModel.cs
index 6c1dd7e..0194f0f 100644
--- a/DaSaSo.ViewModel/Window/MainWindowViewModel.cs
+++ b/DaSaSo.ViewModel/Window/MainWindowViewModel.cs
@@ -1,6 +1,9 @@
 using DaSaSo.Domain.Model;
 using DaSaSo.EntityFramework;
 using DaSaSo.EntityFramework.Services;
+using DaSaSo.ViewModel.Enums;
+using DaSaSo.ViewModel.Interface;
+using DaSaSo.ViewModel.State.Navigation;
 using Microsoft.Toolkit.Mvvm.Input;
 using System;
 using System.Collections.Generic;
@@ -18,6 +21,8 @@ namespace DaSaSo.ViewModel
         private Client _selectedClient;
         private Project _selectedProject;
         private Buildingsite _selectedBuildingsite;
+
+        public INavigator Navigator { get; set; }
         
         public IRelayCommand ListClientsCommand { get; set; }
         public IRelayCommand ListProjectCommand { get; set; }
@@ -85,8 +90,10 @@ namespace DaSaSo.ViewModel
                 }
             }
         }
-        public MainWindowViewModel()
+        public MainWindowViewModel(INavigator navigator)
         {
+            this.Navigator = navigator;
+            Navigator.UpdateViewModelCommand.Execute(EViewType.Home);
             ListClientsCommand = new RelayCommand(showClients);
             ListProjectCommand = new RelayCommand(listProjecte, () => SelectedClient != null);
             ListBuildingsiteCommand = new RelayCommand(listBuildingsite, () => SelectedProject != null);
diff --git a/DaSaSo.Wpf/App.xaml.cs b/DaSaSo.Wpf/App.xaml.cs
index 78cb819..f41a6d1 100644
--- a/DaSaSo.Wpf/App.xaml.cs
+++ b/DaSaSo.Wpf/App.xaml.cs
@@ -4,6 +4,9 @@ using DaSaSo.Domain.Services.ClientServices;
 using DaSaSo.EntityFramework;
 using DaSaSo.EntityFramework.Services;
 using DaSaSo.ViewModel;
+using DaSaSo.ViewModel.Factories;
+using DaSaSo.ViewModel.Interface;
+using DaSaSo.ViewModel.State.Navigation;
 using Microsoft.Extensions.DependencyInjection;
 using System;
 using System.Collections.Generic;
@@ -23,19 +26,27 @@ namespace DaSaSo.Wpf
         protected override async void OnStartup(StartupEventArgs e)
         {
             IServiceProvider serviceProvider = CreateServiceProvider();
-            IDataService<Client> clientService = new ClientDataService(new DaSaSoDbContextFactory());
-            var d = await clientService.GetAll();
-            base.OnStartup(e);
-            MainWindow? window = new MainWindow() { DataContext = new MainWindowViewModel() };
+            
+            MainWindow? window = new MainWindow() { DataContext = serviceProvider.GetRequiredService<MainWindowViewModel>() };
             window.Show();
+            base.OnStartup(e);
         }
 
         private IServiceProvider CreateServiceProvider()
         {
             IServiceCollection services = new ServiceCollection();
 
-            services.AddSingleton<DaSaSoDbContext>();
-            //services.AddSingleton<IDataService<Client>, ClientDataService>();
+            services.AddSingleton<DaSaSoDbContextFactory>();
+            services.AddSingleton<IDataService<Client>, ClientDataService>();
+
+
+            services.AddSingleton<IViewModelAbstractFactory, ViewModelAbstractFactory>();
+            services.AddSingleton<IViewModelFactory<HomeViewModel>, HomeViewModelFactory>();
+            services.AddSingleton<IViewModelFactory<ClientListViewModel>, ClientListViewModelFactory>();
+            services.AddScoped<INavigator, Navigator>();
+
+            services.AddScoped<MainWindowViewModel>();
+            
 
             return services.BuildServiceProvider();
         }
diff --git a/DaSaSo.Wpf/Controls/NavigationBar.xaml b/DaSaSo.Wpf/Controls/NavigationBar.xaml
new file mode 100644
index 0000000..8915f40
--- /dev/null
+++ b/DaSaSo.Wpf/Controls/NavigationBar.xaml
@@ -0,0 +1,22 @@
+<UserControl x:Class="DaSaSo.Wpf.Controls.NavigationBar"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
+             xmlns:local="clr-namespace:DaSaSo.Wpf.Controls"
+             xmlns:nav="clr-namespace:DaSaSo.ViewModel.Enums;assembly=DaSaSo.ViewModel"
+             mc:Ignorable="d" 
+             d:DesignHeight="450" d:DesignWidth="800">
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="auto" />
+            <RowDefinition Height="auto" />
+            <RowDefinition Height="auto" />
+            <RowDefinition Height="auto" />
+        </Grid.RowDefinitions>
+        <RadioButton Grid.Row="0" Content="Kunden" Style="{StaticResource ToggleButtonList}" Command="{Binding UpdateViewModelCommand}" CommandParameter="{x:Static nav:EViewType.Clients}" />
+        <RadioButton Grid.Row="1" Content="Projekte" Style="{StaticResource ToggleButtonList}" Command="{Binding UpdateViewModelCommand}" CommandParameter="{x:Static nav:EViewType.Projects}" />
+        <RadioButton Grid.Row="2" Content="Baustellen" Style="{StaticResource ToggleButtonList}" Command="{Binding UpdateViewModelCommand}" CommandParameter="{x:Static nav:EViewType.Buildingsites}" />
+        <RadioButton Grid.Row="3" Content="Objekten" Style="{StaticResource ToggleButtonList}" Command="{Binding UpdateViewModelCommand}" CommandParameter="{x:Static nav:EViewType.SewerObjects}" />
+    </Grid>
+</UserControl>
diff --git a/DaSaSo.Wpf/Controls/NavigationBar.xaml.cs b/DaSaSo.Wpf/Controls/NavigationBar.xaml.cs
new file mode 100644
index 0000000..4c2d502
--- /dev/null
+++ b/DaSaSo.Wpf/Controls/NavigationBar.xaml.cs
@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace DaSaSo.Wpf.Controls
+{
+    /// <summary>
+    /// Interaction logic for NavigationBar.xaml
+    /// </summary>
+    public partial class NavigationBar : UserControl
+    {
+        public NavigationBar()
+        {
+            InitializeComponent();
+        }
+    }
+}
diff --git a/DaSaSo.Wpf/DaSaSo.Wpf.csproj.user b/DaSaSo.Wpf/DaSaSo.Wpf.csproj.user
index 0ceb2db..6832663 100644
--- a/DaSaSo.Wpf/DaSaSo.Wpf.csproj.user
+++ b/DaSaSo.Wpf/DaSaSo.Wpf.csproj.user
@@ -7,26 +7,41 @@
     </ApplicationDefinition>
   </ItemGroup>
   <ItemGroup>
+    <Compile Update="Controls\NavigationBar.xaml.cs">
+      <SubType>Code</SubType>
+    </Compile>
     <Compile Update="View\Client\ClientEditView.xaml.cs">
       <SubType>Code</SubType>
     </Compile>
     <Compile Update="View\Client\ClientListView.xaml.cs">
       <SubType>Code</SubType>
     </Compile>
+    <Compile Update="View\HomeView.xaml.cs">
+      <SubType>Code</SubType>
+    </Compile>
     <Compile Update="View\Project\ProjectListView.xaml.cs">
       <SubType>Code</SubType>
     </Compile>
   </ItemGroup>
   <ItemGroup>
+    <Page Update="Controls\NavigationBar.xaml">
+      <SubType>Designer</SubType>
+    </Page>
     <Page Update="my_controls.xaml">
       <SubType>Designer</SubType>
     </Page>
+    <Page Update="Styles\Navigation_Style.xaml">
+      <SubType>Designer</SubType>
+    </Page>
     <Page Update="View\Client\ClientEditView.xaml">
       <SubType>Designer</SubType>
     </Page>
     <Page Update="View\Client\ClientListView.xaml">
       <SubType>Designer</SubType>
     </Page>
+    <Page Update="View\HomeView.xaml">
+      <SubType>Designer</SubType>
+    </Page>
     <Page Update="View\Project\ProjectListView.xaml">
       <SubType>Designer</SubType>
     </Page>
diff --git a/DaSaSo.Wpf/Styles/Navigation_Style.xaml b/DaSaSo.Wpf/Styles/Navigation_Style.xaml
new file mode 100644
index 0000000..825650e
--- /dev/null
+++ b/DaSaSo.Wpf/Styles/Navigation_Style.xaml
@@ -0,0 +1,4 @@
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    
+</ResourceDictionary>
\ No newline at end of file
diff --git a/DaSaSo.Wpf/View/HomeView.xaml b/DaSaSo.Wpf/View/HomeView.xaml
new file mode 100644
index 0000000..7f72c16
--- /dev/null
+++ b/DaSaSo.Wpf/View/HomeView.xaml
@@ -0,0 +1,12 @@
+<UserControl x:Class="DaSaSo.Wpf.View.HomeView"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
+             xmlns:local="clr-namespace:DaSaSo.Wpf.View" xmlns:viewmodel="clr-namespace:DaSaSo.ViewModel;assembly=DaSaSo.ViewModel" d:DataContext="{d:DesignInstance Type=viewmodel:HomeViewModel}"
+             mc:Ignorable="d" 
+             d:DesignHeight="450" d:DesignWidth="800">
+    <Grid>
+        <TextBlock Text="{Binding Welcome }" />
+    </Grid>
+</UserControl>
diff --git a/DaSaSo.Wpf/View/HomeView.xaml.cs b/DaSaSo.Wpf/View/HomeView.xaml.cs
new file mode 100644
index 0000000..b7157c0
--- /dev/null
+++ b/DaSaSo.Wpf/View/HomeView.xaml.cs
@@ -0,0 +1,28 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Navigation;
+using System.Windows.Shapes;
+
+namespace DaSaSo.Wpf.View
+{
+    /// <summary>
+    /// Interaction logic for HomeView.xaml
+    /// </summary>
+    public partial class HomeView : UserControl
+    {
+        public HomeView()
+        {
+            InitializeComponent();
+        }
+    }
+}
diff --git a/DaSaSo.Wpf/Window/MainWindow.xaml b/DaSaSo.Wpf/Window/MainWindow.xaml
index 46ff256..c756882 100644
--- a/DaSaSo.Wpf/Window/MainWindow.xaml
+++ b/DaSaSo.Wpf/Window/MainWindow.xaml
@@ -5,6 +5,8 @@
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:ClientViews="clr-namespace:DaSaSo.Wpf.View.Client"
         xmlns:ProjektViews="clr-namespace:DaSaSo.Wpf.View.Project"
+        xmlns:controls="clr-namespace:DaSaSo.Wpf.Controls"
+        xmlns:View="clr-namespace:DaSaSo.Wpf.View"
         xmlns:local="clr-namespace:DaSaSo.Wpf" xmlns:viewmodel="clr-namespace:DaSaSo.ViewModel;assembly=DaSaSo.ViewModel" d:DataContext="{d:DesignInstance Type=viewmodel:MainWindowViewModel}"
         mc:Ignorable="d"
         Title="MainWindow" Height="450" Width="800">
@@ -18,6 +20,9 @@
         <DataTemplate DataType="{x:Type viewmodel:ProjectListViewModel}">
             <ProjektViews:ProjectListView />
         </DataTemplate>
+        <DataTemplate DataType="{x:Type viewmodel:HomeViewModel}">
+            <View:HomeView />
+        </DataTemplate>
     </Window.Resources>
     <Grid>
         <Grid.ColumnDefinitions>
@@ -28,13 +33,8 @@
             <RowDefinition />
             <RowDefinition Height="20" />
         </Grid.RowDefinitions>
-        <StackPanel Grid.Column="0" Grid.Row="0">
-            <RadioButton Content="Kunden" Style="{StaticResource ToggleButtonList}" Command="{Binding ListClientsCommand}" />
-            <RadioButton Content="Projekte" Style="{StaticResource ToggleButtonList}" Command="{Binding ListProjectCommand}" />
-            <RadioButton Content="Baustellen" Style="{StaticResource ToggleButtonList}" Command="{Binding ListBuildingsiteCommand}" />
-            <RadioButton Content="Objekte" Style="{StaticResource ToggleButtonList}" Command="{Binding ListSewerObjectsCommand}" />
-        </StackPanel>
-        <ContentControl Grid.Column="1" Grid.Row="0" Content="{Binding ActualViewModel}" />
+        <controls:NavigationBar Grid.Column="0" Grid.Row="0" DataContext="{Binding Navigator }" />
+        <ContentControl Grid.Column="1" Grid.Row="0" Content="{Binding Navigator.CurrentViewModel}" />
         <StatusBar Grid.Row="1" Grid.ColumnSpan="2">
             <StatusBarItem Content="{Binding SelectedClient.Firstname}" />
         </StatusBar>