Index: Core/Gui/src/Core.Gui/Forms/Backstage/AboutViewModel.cs
===================================================================
diff -u -rc30c93c3f77e0f07d0859c717c639329a63bd468 -r7ed9edfa97f83402ba56d518da451e56f0cdccf6
--- Core/Gui/src/Core.Gui/Forms/Backstage/AboutViewModel.cs	(.../AboutViewModel.cs)	(revision c30c93c3f77e0f07d0859c717c639329a63bd468)
+++ Core/Gui/src/Core.Gui/Forms/Backstage/AboutViewModel.cs	(.../AboutViewModel.cs)	(revision 7ed9edfa97f83402ba56d518da451e56f0cdccf6)
@@ -21,5 +21,5 @@
 
 namespace Core.Gui.Forms.Backstage
 {
-    public class AboutViewModel : IViewModel {}
+    public class AboutViewModel : IBackstagePageViewModel {}
 }
\ No newline at end of file
Index: Core/Gui/src/Core.Gui/Forms/Backstage/BackstageControl.xaml
===================================================================
diff -u -r2f8eceba36e55965b2d861414826454261bcbec0 -r7ed9edfa97f83402ba56d518da451e56f0cdccf6
--- Core/Gui/src/Core.Gui/Forms/Backstage/BackstageControl.xaml	(.../BackstageControl.xaml)	(revision 2f8eceba36e55965b2d861414826454261bcbec0)
+++ Core/Gui/src/Core.Gui/Forms/Backstage/BackstageControl.xaml	(.../BackstageControl.xaml)	(revision 7ed9edfa97f83402ba56d518da451e56f0cdccf6)
@@ -151,7 +151,7 @@
                 </Button>
                 <controls:OneWayToggleButton Style="{StaticResource BackstageToggleButtonStyle}"
                                              Content="{x:Static properties:Resources.Info_DisplayName}"
-                                             Command="{Binding SetCurrentViewModelCommand}"
+                                             Command="{Binding SetSelectedViewModelCommand}"
                                              CommandParameter="{Binding InfoViewModel}" 
                                              IsChecked="{Binding InfoSelected, Mode=OneWay}" />
                 <Separator Style="{StaticResource BackstageSeparatorStyle}" />
@@ -160,7 +160,7 @@
                         Command="{x:Static commands:MainWindowCommands.NewProjectCommand}" />
                 <controls:OneWayToggleButton Style="{StaticResource BackstageToggleButtonStyle}"
                                              Content="{x:Static properties:Resources.OpenProject_DisplayName}"
-                                             Command="{Binding SetCurrentViewModelCommand}"
+                                             Command="{Binding SetSelectedViewModelCommand}"
                                              CommandParameter="{Binding OpenViewModel}"
                                              IsChecked="{Binding OpenSelected, Mode=OneWay}" />
                 <Button Style="{StaticResource BackstageButtonStyle}"
@@ -172,7 +172,7 @@
                 <Separator Style="{StaticResource BackstageSeparatorStyle}" />
                 <controls:OneWayToggleButton Style="{StaticResource BackstageToggleButtonStyle}"
                                              Content="{x:Static properties:Resources.About_DisplayName}"
-                                             Command="{Binding SetCurrentViewModelCommand}"
+                                             Command="{Binding SetSelectedViewModelCommand}"
                                              CommandParameter="{Binding AboutViewModel}"
                                              IsChecked="{Binding AboutSelected, Mode=OneWay}" />
                 <Button Style="{StaticResource BackstageButtonStyle}"
@@ -187,7 +187,7 @@
                         Command="{x:Static commands:MainWindowCommands.CloseApplicationCommand}" />
             </StackPanel>
 
-            <ContentControl Content="{Binding CurrentViewModel}"
+            <ContentControl Content="{Binding SelectedViewModel}"
                             Background="{StaticResource BackstageBackgroundColorBrush}"/>
         </DockPanel>
     </Grid>
Index: Core/Gui/src/Core.Gui/Forms/Backstage/BackstageViewModel.cs
===================================================================
diff -u -r2f8eceba36e55965b2d861414826454261bcbec0 -r7ed9edfa97f83402ba56d518da451e56f0cdccf6
--- Core/Gui/src/Core.Gui/Forms/Backstage/BackstageViewModel.cs	(.../BackstageViewModel.cs)	(revision 2f8eceba36e55965b2d861414826454261bcbec0)
+++ Core/Gui/src/Core.Gui/Forms/Backstage/BackstageViewModel.cs	(.../BackstageViewModel.cs)	(revision 7ed9edfa97f83402ba56d518da451e56f0cdccf6)
@@ -26,47 +26,76 @@
 
 namespace Core.Gui.Forms.Backstage
 {
+    /// <summary>
+    /// ViewModel for the <see cref="BackstageControl"/>.
+    /// </summary>
     public class BackstageViewModel : INotifyPropertyChanged
     {
-        private IViewModel currentViewModel;
+        private IBackstagePageViewModel selectedViewModel;
         private bool infoSelected;
         private bool openSelected;
         private bool aboutSelected;
+        
         public event PropertyChangedEventHandler PropertyChanged;
 
+        /// <summary>
+        /// Creates a new instance of <see cref="BackstageViewModel"/>.
+        /// </summary>
         public BackstageViewModel()
         {
             InfoViewModel = new InfoViewModel();
             OpenViewModel = new OpenViewModel();
             AboutViewModel = new AboutViewModel();
 
-            SetCurrentViewModelCommand = new RelayCommand(OnSetCurrentViewModel);
+            SetSelectedViewModelCommand = new RelayCommand(OnSetCurrentViewModel);
 
-            CurrentViewModel = InfoViewModel;
+            SelectedViewModel = InfoViewModel;
         }
 
-        public ICommand SetCurrentViewModelCommand { get; }
-        public IViewModel InfoViewModel { get; }
-        public IViewModel OpenViewModel { get; }
-        public IViewModel AboutViewModel { get; }
+        /// <summary>
+        /// Gets the command to set the selected view model.
+        /// </summary>
+        public ICommand SetSelectedViewModelCommand { get; }
+        
+        /// <summary>
+        /// Gets the <see cref="InfoViewModel"/>.
+        /// </summary>
+        public InfoViewModel InfoViewModel { get; }
+        
+        /// <summary>
+        /// Gets the <see cref="OpenViewModel"/>.
+        /// </summary>
+        public OpenViewModel OpenViewModel { get; }
+        
+        /// <summary>
+        /// Gets the <see cref="AboutViewModel"/>.
+        /// </summary>
+        public AboutViewModel AboutViewModel { get; }
 
-        public IViewModel CurrentViewModel
+        /// <summary>
+        /// Gets or sets the selected view model.
+        /// </summary>
+        public IBackstagePageViewModel SelectedViewModel
         {
-            get => currentViewModel;
+            get => selectedViewModel;
             set
             {
-                if (value == currentViewModel)
+                if (value == selectedViewModel)
                 {
                     return;
                 }
 
-                currentViewModel = value;
-                OnPropertyChanged(nameof(CurrentViewModel));
+                selectedViewModel = value;
+                OnPropertyChanged(nameof(SelectedViewModel));
 
                 SetButtonStates();
             }
         }
 
+        /// <summary>
+        /// Gets an indicator whether the <see cref="InfoViewModel"/>
+        /// is selected.
+        /// </summary>
         public bool InfoSelected
         {
             get => infoSelected;
@@ -77,6 +106,10 @@
             }
         }
 
+        /// <summary>
+        /// Gets an indicator whether the <see cref="OpenViewModel"/>
+        /// is selected.
+        /// </summary>
         public bool OpenSelected
         {
             get => openSelected;
@@ -87,6 +120,10 @@
             }
         }
 
+        /// <summary>
+        /// Gets an indicator whether the <see cref="AboutViewModel"/>
+        /// is selected.
+        /// </summary>
         public bool AboutSelected
         {
             get => aboutSelected;
@@ -104,14 +141,14 @@
 
         private void SetButtonStates()
         {
-            InfoSelected = currentViewModel is InfoViewModel;
-            OpenSelected = currentViewModel is OpenViewModel;
-            AboutSelected = currentViewModel is AboutViewModel;
+            InfoSelected = selectedViewModel is InfoViewModel;
+            OpenSelected = selectedViewModel is OpenViewModel;
+            AboutSelected = selectedViewModel is AboutViewModel;
         }
 
         private void OnSetCurrentViewModel(object obj)
         {
-            CurrentViewModel = (IViewModel) obj;
+            SelectedViewModel = (IBackstagePageViewModel) obj;
         }
     }
 }
\ No newline at end of file
Index: Core/Gui/src/Core.Gui/Forms/Backstage/IBackstagePageViewModel.cs
===================================================================
diff -u -rc30c93c3f77e0f07d0859c717c639329a63bd468 -r7ed9edfa97f83402ba56d518da451e56f0cdccf6
--- Core/Gui/src/Core.Gui/Forms/Backstage/IBackstagePageViewModel.cs	(.../IBackstagePageViewModel.cs)	(revision c30c93c3f77e0f07d0859c717c639329a63bd468)
+++ Core/Gui/src/Core.Gui/Forms/Backstage/IBackstagePageViewModel.cs	(.../IBackstagePageViewModel.cs)	(revision 7ed9edfa97f83402ba56d518da451e56f0cdccf6)
@@ -21,5 +21,5 @@
 
 namespace Core.Gui.Forms.Backstage
 {
-    public interface IViewModel {}
+    public interface IBackstagePageViewModel {}
 }
\ No newline at end of file
Index: Core/Gui/src/Core.Gui/Forms/Backstage/InfoViewModel.cs
===================================================================
diff -u -rc30c93c3f77e0f07d0859c717c639329a63bd468 -r7ed9edfa97f83402ba56d518da451e56f0cdccf6
--- Core/Gui/src/Core.Gui/Forms/Backstage/InfoViewModel.cs	(.../InfoViewModel.cs)	(revision c30c93c3f77e0f07d0859c717c639329a63bd468)
+++ Core/Gui/src/Core.Gui/Forms/Backstage/InfoViewModel.cs	(.../InfoViewModel.cs)	(revision 7ed9edfa97f83402ba56d518da451e56f0cdccf6)
@@ -21,5 +21,5 @@
 
 namespace Core.Gui.Forms.Backstage
 {
-    public class InfoViewModel : IViewModel {}
+    public class InfoViewModel : IBackstagePageViewModel {}
 }
\ No newline at end of file
Index: Core/Gui/src/Core.Gui/Forms/Backstage/OpenViewModel.cs
===================================================================
diff -u -rc30c93c3f77e0f07d0859c717c639329a63bd468 -r7ed9edfa97f83402ba56d518da451e56f0cdccf6
--- Core/Gui/src/Core.Gui/Forms/Backstage/OpenViewModel.cs	(.../OpenViewModel.cs)	(revision c30c93c3f77e0f07d0859c717c639329a63bd468)
+++ Core/Gui/src/Core.Gui/Forms/Backstage/OpenViewModel.cs	(.../OpenViewModel.cs)	(revision 7ed9edfa97f83402ba56d518da451e56f0cdccf6)
@@ -21,5 +21,5 @@
 
 namespace Core.Gui.Forms.Backstage
 {
-    public class OpenViewModel : IViewModel {}
+    public class OpenViewModel : IBackstagePageViewModel {}
 }
\ No newline at end of file
Index: Core/Gui/test/Core.Gui.Test/Forms/Backstage/AboutViewModelTest.cs
===================================================================
diff -u
--- Core/Gui/test/Core.Gui.Test/Forms/Backstage/AboutViewModelTest.cs	(revision 0)
+++ Core/Gui/test/Core.Gui.Test/Forms/Backstage/AboutViewModelTest.cs	(revision 7ed9edfa97f83402ba56d518da451e56f0cdccf6)
@@ -0,0 +1,40 @@
+// Copyright (C) Stichting Deltares 2021. All rights reserved.
+//
+// This file is part of Riskeer.
+//
+// Riskeer is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using Core.Gui.Forms.Backstage;
+using NUnit.Framework;
+
+namespace Core.Gui.Test.Forms.Backstage
+{
+    [TestFixture]
+    public class AboutViewModelTest
+    {
+        [Test]
+        public void Constructor_ExpectedValues()
+        {
+            // Call
+            var viewModel = new AboutViewModel();
+
+            // Assert
+            Assert.IsInstanceOf<IBackstagePageViewModel>(viewModel);
+        }
+    }
+}
\ No newline at end of file
Index: Core/Gui/test/Core.Gui.Test/Forms/Backstage/BackstageControlTest.cs
===================================================================
diff -u
--- Core/Gui/test/Core.Gui.Test/Forms/Backstage/BackstageControlTest.cs	(revision 0)
+++ Core/Gui/test/Core.Gui.Test/Forms/Backstage/BackstageControlTest.cs	(revision 7ed9edfa97f83402ba56d518da451e56f0cdccf6)
@@ -0,0 +1,42 @@
+// Copyright (C) Stichting Deltares 2021. All rights reserved.
+//
+// This file is part of Riskeer.
+//
+// Riskeer is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System.Windows.Controls;
+using Core.Gui.Forms.Backstage;
+using NUnit.Framework;
+
+namespace Core.Gui.Test.Forms.Backstage
+{
+    [TestFixture]
+    public class BackstageControlTest
+    {
+        [Test]
+        public void Constructor_ExpectedValues()
+        {
+            // Call
+            var backstageControl = new BackstageControl();
+
+            // Assert
+            Assert.IsInstanceOf<UserControl>(backstageControl);
+            Assert.IsNotNull(backstageControl.DataContext);
+        }
+    }
+}
\ No newline at end of file
Index: Core/Gui/test/Core.Gui.Test/Forms/Backstage/BackstageViewModelTest.cs
===================================================================
diff -u
--- Core/Gui/test/Core.Gui.Test/Forms/Backstage/BackstageViewModelTest.cs	(revision 0)
+++ Core/Gui/test/Core.Gui.Test/Forms/Backstage/BackstageViewModelTest.cs	(revision 7ed9edfa97f83402ba56d518da451e56f0cdccf6)
@@ -0,0 +1,117 @@
+// Copyright (C) Stichting Deltares 2021. All rights reserved.
+//
+// This file is part of Riskeer.
+//
+// Riskeer is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using Core.Gui.Forms.Backstage;
+using NUnit.Framework;
+
+namespace Core.Gui.Test.Forms.Backstage
+{
+    [TestFixture]
+    public class BackstageViewModelTest
+    {
+        [Test]
+        public void Constructor_ExpectedValues()
+        {
+            // Call
+            var viewModel = new BackstageViewModel();
+
+            // Assert
+            Assert.IsInstanceOf<INotifyPropertyChanged>(viewModel);
+            
+            Assert.IsNotNull(viewModel.InfoViewModel);
+            Assert.IsNotNull(viewModel.OpenViewModel);
+            Assert.IsNotNull(viewModel.AboutViewModel);
+            
+            Assert.IsNotNull(viewModel.SetSelectedViewModelCommand);
+            
+            Assert.AreSame(viewModel.InfoViewModel, viewModel.SelectedViewModel);
+            Assert.IsTrue(viewModel.InfoSelected);
+            Assert.IsFalse(viewModel.OpenSelected);
+            Assert.IsFalse(viewModel.AboutSelected);
+        }
+
+        [Test]
+        [TestCaseSource(nameof(GetBackstagePageViewModels))]
+        public void GivenViewModel_WhenExecutingSetSelectedViewModelCommand_ThenExpectedValuesSet(
+            Func<BackstageViewModel, IBackstagePageViewModel> getBackstagePageViewModelFunc,
+            bool infoSelected, bool openSelected, bool aboutSelected)
+        {
+            // Given
+            var viewModel = new BackstageViewModel();
+            IBackstagePageViewModel backstagePageViewModel = getBackstagePageViewModelFunc(viewModel);
+
+            if (backstagePageViewModel is InfoViewModel)
+            {
+                viewModel.SelectedViewModel = viewModel.AboutViewModel;
+            }
+            
+            // When
+            viewModel.SetSelectedViewModelCommand.Execute(backstagePageViewModel);
+            
+            // Assert
+            Assert.AreSame(backstagePageViewModel, viewModel.SelectedViewModel);
+            Assert.AreEqual(infoSelected, viewModel.InfoSelected);
+            Assert.AreEqual(openSelected, viewModel.OpenSelected);
+            Assert.AreEqual(aboutSelected, viewModel.AboutSelected);
+        }
+
+        [Test]
+        [TestCaseSource(nameof(GetBackstagePageViewModels))]
+        public void GivenViewModel_WhenExecutingSetSelectedViewModelCommandAndSetToSameViewModel_ThenNothingHappens(
+            Func<BackstageViewModel, IBackstagePageViewModel> getBackstagePageViewModelFunc,
+            bool infoSelected, bool openSelected, bool aboutSelected)
+        {
+            // Given
+            var viewModel = new BackstageViewModel();
+            IBackstagePageViewModel backstagePageViewModel = getBackstagePageViewModelFunc(viewModel);
+
+            viewModel.SelectedViewModel = backstagePageViewModel;
+
+            // Precondition
+            Assert.AreSame(backstagePageViewModel, viewModel.SelectedViewModel);
+            Assert.AreEqual(infoSelected, viewModel.InfoSelected);
+            Assert.AreEqual(openSelected, viewModel.OpenSelected);
+            Assert.AreEqual(aboutSelected, viewModel.AboutSelected);
+
+            // When
+            viewModel.SetSelectedViewModelCommand.Execute(backstagePageViewModel);
+
+            // Assert
+            Assert.AreSame(backstagePageViewModel, viewModel.SelectedViewModel);
+            Assert.AreEqual(infoSelected, viewModel.InfoSelected);
+            Assert.AreEqual(openSelected, viewModel.OpenSelected);
+            Assert.AreEqual(aboutSelected, viewModel.AboutSelected);
+        }
+
+        private static IEnumerable<TestCaseData> GetBackstagePageViewModels()
+        {
+            yield return new TestCaseData(new Func<BackstageViewModel, IBackstagePageViewModel>(
+                                              viewModel => viewModel.InfoViewModel), true, false ,false);
+            yield return new TestCaseData(new Func<BackstageViewModel, IBackstagePageViewModel>(
+                                              viewModel => viewModel.OpenViewModel), false, true, false);
+            yield return new TestCaseData(new Func<BackstageViewModel, IBackstagePageViewModel>(
+                                              viewModel => viewModel.AboutViewModel), false, false, true);
+        }
+    }
+}
\ No newline at end of file
Index: Core/Gui/test/Core.Gui.Test/Forms/Backstage/InfoViewModelTest.cs
===================================================================
diff -u
--- Core/Gui/test/Core.Gui.Test/Forms/Backstage/InfoViewModelTest.cs	(revision 0)
+++ Core/Gui/test/Core.Gui.Test/Forms/Backstage/InfoViewModelTest.cs	(revision 7ed9edfa97f83402ba56d518da451e56f0cdccf6)
@@ -0,0 +1,40 @@
+// Copyright (C) Stichting Deltares 2021. All rights reserved.
+//
+// This file is part of Riskeer.
+//
+// Riskeer is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using Core.Gui.Forms.Backstage;
+using NUnit.Framework;
+
+namespace Core.Gui.Test.Forms.Backstage
+{
+    [TestFixture]
+    public class InfoViewModelTest
+    {
+        [Test]
+        public void Constructor_ExpectedValues()
+        {
+            // Call
+            var viewModel = new AboutViewModel();
+
+            // Assert
+            Assert.IsInstanceOf<IBackstagePageViewModel>(viewModel);
+        }
+    }
+}
\ No newline at end of file
Index: Core/Gui/test/Core.Gui.Test/Forms/Backstage/OpenViewModelTest.cs
===================================================================
diff -u
--- Core/Gui/test/Core.Gui.Test/Forms/Backstage/OpenViewModelTest.cs	(revision 0)
+++ Core/Gui/test/Core.Gui.Test/Forms/Backstage/OpenViewModelTest.cs	(revision 7ed9edfa97f83402ba56d518da451e56f0cdccf6)
@@ -0,0 +1,40 @@
+// Copyright (C) Stichting Deltares 2021. All rights reserved.
+//
+// This file is part of Riskeer.
+//
+// Riskeer is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// All names, logos, and references to "Deltares" are registered trademarks of
+// Stichting Deltares and remain full property of Stichting Deltares at all times.
+// All rights reserved.
+
+using Core.Gui.Forms.Backstage;
+using NUnit.Framework;
+
+namespace Core.Gui.Test.Forms.Backstage
+{
+    [TestFixture]
+    public class OpenViewModelTest
+    {
+        [Test]
+        public void Constructor_ExpectedValues()
+        {
+            // Call
+            var viewModel = new AboutViewModel();
+
+            // Assert
+            Assert.IsInstanceOf<IBackstagePageViewModel>(viewModel);
+        }
+    }
+}
\ No newline at end of file