Index: Core/Gui/src/Core.Gui/Commands/MainWindowCommands.cs
===================================================================
diff -u -rd4814858f4bc4a2fe79402a990f9076ef28d16a8 -r8339a812e145eab080917a65ceb6d27472b7c076
--- Core/Gui/src/Core.Gui/Commands/MainWindowCommands.cs	(.../MainWindowCommands.cs)	(revision d4814858f4bc4a2fe79402a990f9076ef28d16a8)
+++ Core/Gui/src/Core.Gui/Commands/MainWindowCommands.cs	(.../MainWindowCommands.cs)	(revision 8339a812e145eab080917a65ceb6d27472b7c076)
@@ -62,5 +62,10 @@
         /// The command for opening the log file.
         /// </summary>
         public static readonly ICommand OpenLogFileCommand = new RoutedCommand();
+
+        /// <summary>
+        /// The command for opening the user manual.
+        /// </summary>
+        public static readonly ICommand OpenUserManualCommand = new RoutedCommand();
     }
 }
\ No newline at end of file
Index: Core/Gui/src/Core.Gui/Forms/Backstage/BackstageControl.xaml
===================================================================
diff -u -rd4814858f4bc4a2fe79402a990f9076ef28d16a8 -r8339a812e145eab080917a65ceb6d27472b7c076
--- Core/Gui/src/Core.Gui/Forms/Backstage/BackstageControl.xaml	(.../BackstageControl.xaml)	(revision d4814858f4bc4a2fe79402a990f9076ef28d16a8)
+++ Core/Gui/src/Core.Gui/Forms/Backstage/BackstageControl.xaml	(.../BackstageControl.xaml)	(revision 8339a812e145eab080917a65ceb6d27472b7c076)
@@ -48,7 +48,7 @@
                 <Separator/>
                 <ToggleButton>OVER</ToggleButton>
                 <Button Command="{x:Static commands:MainWindowCommands.OpenLogFileCommand}">Toon log</Button>
-                <Button>Handleiding</Button>
+                <Button Command="{x:Static commands:MainWindowCommands.OpenUserManualCommand}">Handleiding</Button>
                 <Separator/>
                 <Button Command="{x:Static commands:MainWindowCommands.CloseApplicationCommand}">Afsluiten</Button>
             </StackPanel>
Index: Core/Gui/src/Core.Gui/Forms/MainWindow/MainWindow.xaml
===================================================================
diff -u -rd4814858f4bc4a2fe79402a990f9076ef28d16a8 -r8339a812e145eab080917a65ceb6d27472b7c076
--- Core/Gui/src/Core.Gui/Forms/MainWindow/MainWindow.xaml	(.../MainWindow.xaml)	(revision d4814858f4bc4a2fe79402a990f9076ef28d16a8)
+++ Core/Gui/src/Core.Gui/Forms/MainWindow/MainWindow.xaml	(.../MainWindow.xaml)	(revision 8339a812e145eab080917a65ceb6d27472b7c076)
@@ -53,6 +53,8 @@
                                        Command="{Binding Path=ToggleBackstageCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=metro:MetroWindow}}" />
         <commands:RoutedCommandHandler RoutedCommand="{x:Static commands:MainWindowCommands.OpenLogFileCommand}"
                                        Command="{Binding Path=OpenLogFileCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=metro:MetroWindow}}" />
+        <commands:RoutedCommandHandler RoutedCommand="{x:Static commands:MainWindowCommands.OpenUserManualCommand}"
+                                       Command="{Binding Path=OpenUserManualCommand, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=metro:MetroWindow}}" />
     </commands:RoutedCommandHandlers.Commands>
 
     <metro:MetroWindow.InputBindings>
@@ -182,11 +184,9 @@
                             AutomationProperties.AutomationId="ViewStateButtonBarShowLog">
                         <TextBlock Style="{StaticResource ButtonIconStyle}" Text="&#xE946;"/>
                     </Button>
-                    <Button Name="FileManualButton"
-                            Style="{StaticResource ViewStateBarButtonStyle}"
+                    <Button Style="{StaticResource ViewStateBarButtonStyle}"
                             ToolTip="{x:Static properties:Resources.ViewStateBar_OpenManual_ToolTip}"
-                            Click="OnFileManual_Clicked"
-                            x:FieldModifier="private"
+                            Command="{x:Static commands:MainWindowCommands.OpenUserManualCommand}"
                             AutomationProperties.AutomationId="ViewStateButtonBarOpenManual">
                         <TextBlock Style="{StaticResource ButtonIconStyle}" Text="&#xE92D;"/>
                     </Button>
Index: Core/Gui/src/Core.Gui/Forms/MainWindow/MainWindow.xaml.cs
===================================================================
diff -u -rd4814858f4bc4a2fe79402a990f9076ef28d16a8 -r8339a812e145eab080917a65ceb6d27472b7c076
--- Core/Gui/src/Core.Gui/Forms/MainWindow/MainWindow.xaml.cs	(.../MainWindow.xaml.cs)	(revision d4814858f4bc4a2fe79402a990f9076ef28d16a8)
+++ Core/Gui/src/Core.Gui/Forms/MainWindow/MainWindow.xaml.cs	(.../MainWindow.xaml.cs)	(revision 8339a812e145eab080917a65ceb6d27472b7c076)
@@ -94,6 +94,7 @@
             TogglePropertyGridViewCommand = new RelayCommand(OnTogglePropertyGridView);
             ToggleMessageWindowCommand = new RelayCommand(OnToggleMessageWindow);
             OpenLogFileCommand = new RelayCommand(OnOpenLogFile);
+            OpenUserManualCommand = new RelayCommand(OnOpenUserManual, CanOpenUserManual);
         }
 
         /// <summary>
@@ -328,6 +329,41 @@
             UpdateProjectExplorer();
         }
 
+        #region OnClick events
+
+        private void OnAboutDialog_Clicked(object sender, RoutedEventArgs e)
+        {
+            var aboutDialog = new SplashScreen.SplashScreen
+            {
+                VersionText = SettingsHelper.Instance.ApplicationVersion,
+                SupportEmail = settings.FixedSettings.SupportEmailAddress,
+                SupportPhoneNumber = settings.FixedSettings.SupportPhoneNumber,
+                AllowsTransparency = false,
+                WindowStyle = WindowStyle.SingleBorderWindow,
+                Title = Properties.Resources.ViewStateBar_About_ToolTip,
+                Icon = Imaging.CreateBitmapSourceFromHBitmap(Properties.Resources.information.GetHbitmap(),
+                                                             IntPtr.Zero,
+                                                             Int32Rect.Empty,
+                                                             BitmapSizeOptions.FromEmptyOptions()),
+                ShowInTaskbar = false,
+                Owner = this,
+                WindowStartupLocation = WindowStartupLocation.CenterOwner
+            };
+
+            aboutDialog.PreviewKeyDown += (s, ev) =>
+            {
+                if (ev.Key == Key.Escape)
+                {
+                    ev.Handled = true;
+                    aboutDialog.Shutdown();
+                }
+            };
+
+            aboutDialog.ShowDialog();
+        }
+
+        #endregion
+
         #region Commands
 
         /// <summary>
@@ -395,6 +431,11 @@
         /// </summary>
         public ICommand OpenLogFileCommand { get; }
 
+        /// <summary>
+        /// Gets the command to open the user manual.
+        /// </summary>
+        public ICommand OpenUserManualCommand { get; }
+
         private void OnNewProject(object obj)
         {
             commands.StorageCommands.CreateNewProject();
@@ -495,49 +536,14 @@
             commands.ApplicationCommands.OpenLogFileExternal();
         }
 
-        #endregion
-
-        #region OnClick events
-
-        private void OnFileManual_Clicked(object sender, RoutedEventArgs e)
+        private bool CanOpenUserManual(object obj)
         {
-            string manualFileName = settings.FixedSettings.ManualFilePath;
-
-            if (File.Exists(manualFileName))
-            {
-                Process.Start(manualFileName);
-            }
+            return File.Exists(settings?.FixedSettings.ManualFilePath);
         }
 
-        private void OnAboutDialog_Clicked(object sender, RoutedEventArgs e)
+        private void OnOpenUserManual(object obj)
         {
-            var aboutDialog = new SplashScreen.SplashScreen
-            {
-                VersionText = SettingsHelper.Instance.ApplicationVersion,
-                SupportEmail = settings.FixedSettings.SupportEmailAddress,
-                SupportPhoneNumber = settings.FixedSettings.SupportPhoneNumber,
-                AllowsTransparency = false,
-                WindowStyle = WindowStyle.SingleBorderWindow,
-                Title = Properties.Resources.ViewStateBar_About_ToolTip,
-                Icon = Imaging.CreateBitmapSourceFromHBitmap(Properties.Resources.information.GetHbitmap(),
-                                                             IntPtr.Zero,
-                                                             Int32Rect.Empty,
-                                                             BitmapSizeOptions.FromEmptyOptions()),
-                ShowInTaskbar = false,
-                Owner = this,
-                WindowStartupLocation = WindowStartupLocation.CenterOwner
-            };
-
-            aboutDialog.PreviewKeyDown += (s, ev) =>
-            {
-                if (ev.Key == Key.Escape)
-                {
-                    ev.Handled = true;
-                    aboutDialog.Shutdown();
-                }
-            };
-
-            aboutDialog.ShowDialog();
+            Process.Start(settings.FixedSettings.ManualFilePath);
         }
 
         #endregion
@@ -625,8 +631,6 @@
         {
             WindowState = WindowState.Maximized;
 
-            FileManualButton.IsEnabled = File.Exists(settings.FixedSettings.ManualFilePath);
-
             ValidateItems();
         }
 
Index: Core/Gui/test/Core.Gui.Test/Commands/MainWindowCommandsTest.cs
===================================================================
diff -u -rd4814858f4bc4a2fe79402a990f9076ef28d16a8 -r8339a812e145eab080917a65ceb6d27472b7c076
--- Core/Gui/test/Core.Gui.Test/Commands/MainWindowCommandsTest.cs	(.../MainWindowCommandsTest.cs)	(revision d4814858f4bc4a2fe79402a990f9076ef28d16a8)
+++ Core/Gui/test/Core.Gui.Test/Commands/MainWindowCommandsTest.cs	(.../MainWindowCommandsTest.cs)	(revision 8339a812e145eab080917a65ceb6d27472b7c076)
@@ -39,6 +39,7 @@
             ICommand closeApplicationCommand = MainWindowCommands.CloseApplicationCommand;
             ICommand toggleBackstageCommand = MainWindowCommands.ToggleBackstageCommand;
             ICommand openLogFileCommand = MainWindowCommands.OpenLogFileCommand;
+            ICommand openUserManualCommand = MainWindowCommands.OpenUserManualCommand;
 
             // Assert
             Assert.IsInstanceOf<RoutedCommand>(newProjectCommand);
@@ -48,6 +49,7 @@
             Assert.IsInstanceOf<RoutedCommand>(closeApplicationCommand);
             Assert.IsInstanceOf<RoutedCommand>(toggleBackstageCommand);
             Assert.IsInstanceOf<RoutedCommand>(openLogFileCommand);
+            Assert.IsInstanceOf<RoutedCommand>(openUserManualCommand);
         }
     }
 }
\ No newline at end of file
Index: Core/Gui/test/Core.Gui.Test/Forms/MainWindow/MainWindowTest.cs
===================================================================
diff -u -r3892dc6e3a66bcd3bc86297c30aee45d916ac841 -r8339a812e145eab080917a65ceb6d27472b7c076
--- Core/Gui/test/Core.Gui.Test/Forms/MainWindow/MainWindowTest.cs	(.../MainWindowTest.cs)	(revision 3892dc6e3a66bcd3bc86297c30aee45d916ac841)
+++ Core/Gui/test/Core.Gui.Test/Forms/MainWindow/MainWindowTest.cs	(.../MainWindowTest.cs)	(revision 8339a812e145eab080917a65ceb6d27472b7c076)
@@ -24,6 +24,7 @@
 using System.ComponentModel;
 using System.IO;
 using System.Linq;
+using System.Reflection;
 using System.Threading;
 using System.Windows;
 using System.Windows.Input;
@@ -109,6 +110,13 @@
                 Assert.IsNotNull(mainWindow.OpenProjectCommand);
                 Assert.IsNotNull(mainWindow.CloseApplicationCommand);
                 Assert.IsNotNull(mainWindow.ToggleBackstageCommand);
+                Assert.IsNotNull(mainWindow.ToggleProjectExplorerCommand);
+                Assert.IsNotNull(mainWindow.ToggleMapLegendViewCommand);
+                Assert.IsNotNull(mainWindow.ToggleChartLegendViewCommand);
+                Assert.IsNotNull(mainWindow.TogglePropertyGridViewCommand);
+                Assert.IsNotNull(mainWindow.ToggleMessageWindowCommand);
+                Assert.IsNotNull(mainWindow.OpenLogFileCommand);
+                Assert.IsNotNull(mainWindow.OpenUserManualCommand);
             }
         }
 
@@ -1173,6 +1181,46 @@
             mocks.VerifyAll();
         }
 
+        [Test]
+        [TestCase(true)]
+        [TestCase(false)]
+        public void GivenMainWindowWithOrWithoutUserManual_WhenCanExecuteOpenUserManualCommand_ThenExpectedValue(bool userManualPresent)
+        {
+            // Given
+            var mocks = new MockRepository();
+            var project = mocks.Stub<IProject>();
+            var projectStore = mocks.Stub<IStoreProject>();
+            var projectMigrator = mocks.Stub<IMigrateProject>();
+            var projectFactory = mocks.Stub<IProjectFactory>();
+            projectFactory.Stub(pf => pf.CreateNewProject())
+                          .Return(project);
+            mocks.ReplayAll();
+
+            string path = Uri.UnescapeDataString(new UriBuilder(Assembly.GetExecutingAssembly().CodeBase).Path);
+
+            var settings = new GuiCoreSettings
+            {
+                ManualFilePath = userManualPresent ? path : null
+            };
+            
+            using (var mainWindow = new Gui.Forms.MainWindow.MainWindow())
+            using (var gui = new GuiCore(mainWindow, projectStore, projectMigrator, projectFactory, settings))
+            {
+                gui.Plugins.Add(new TestPlugin());
+                gui.Run();
+
+                mainWindow.SetGui(gui);
+                
+                // When
+                bool canExecute = mainWindow.OpenUserManualCommand.CanExecute(null);
+
+                // Then
+                Assert.AreEqual(userManualPresent, canExecute);
+            }
+
+            mocks.VerifyAll();
+        }
+
         private static void ToggleToolViewAndAssert(Func<Gui.Forms.MainWindow.MainWindow, IView> getToolViewFunc,
                                                     Func<Gui.Forms.MainWindow.MainWindow, ICommand> getCommandFunc,
                                                     bool initiallyAdded)