diff --git a/MessageCommunicator.TestGui/ViewServices/_AboutDialog/AboutDialogControl.xaml b/MessageCommunicator.TestGui/ViewServices/_AboutDialog/AboutDialogControl.xaml
index 2f6e13c..f7c7531 100644
--- a/MessageCommunicator.TestGui/ViewServices/_AboutDialog/AboutDialogControl.xaml
+++ b/MessageCommunicator.TestGui/ViewServices/_AboutDialog/AboutDialogControl.xaml
@@ -8,7 +8,19 @@
         Width="610" Height="400"
         x:Class="MessageCommunicator.TestGui.ViewServices.AboutDialogControl">
     
-    <Grid>
-        <TextBox>About ;)</TextBox>
-    </Grid>
+    <DockPanel LastChildFill="True">
+        <StackPanel Orientation="Horizontal" DockPanel.Dock="Bottom"
+                    HorizontalAlignment="Right">
+            <StackPanel.Styles>
+                <Style Selector="Button">
+                    <Setter Property="Width" Value="125" />
+                    <Setter Property="Margin" Value="3" />
+                </Style>
+            </StackPanel.Styles>
+          
+            <Button Content="OK" IsDefault="True" Command="{Binding Path=Command_Close}" />
+        </StackPanel>
+      
+        <localRoot:PropertyGrid SelectedObject="{Binding Path=Self}" />
+    </DockPanel>
 </UserControl>
\ No newline at end of file
diff --git a/MessageCommunicator.TestGui/ViewServices/_AboutDialog/AboutDialogControl.xaml.cs b/MessageCommunicator.TestGui/ViewServices/_AboutDialog/AboutDialogControl.xaml.cs
index 4fc3349..88b6620 100644
--- a/MessageCommunicator.TestGui/ViewServices/_AboutDialog/AboutDialogControl.xaml.cs
+++ b/MessageCommunicator.TestGui/ViewServices/_AboutDialog/AboutDialogControl.xaml.cs
@@ -10,7 +10,7 @@
 
 namespace MessageCommunicator.TestGui.ViewServices
 {
-    public class AboutDialogControl : OwnUserControlDialog<OwnViewModelBase>
+    public class AboutDialogControl : OwnUserControlDialog<AboutDialogViewModel>
     {
         public AboutDialogControl()
         {
diff --git a/MessageCommunicator.TestGui/ViewServices/_AboutDialog/AboutDialogService.cs b/MessageCommunicator.TestGui/ViewServices/_AboutDialog/AboutDialogService.cs
index e2bda6e..bf13838 100644
--- a/MessageCommunicator.TestGui/ViewServices/_AboutDialog/AboutDialogService.cs
+++ b/MessageCommunicator.TestGui/ViewServices/_AboutDialog/AboutDialogService.cs
@@ -18,7 +18,8 @@ public AboutDialogService(DialogHostControl host)
         public Task ShowAboutDialogAsync()
         {
             var aboutDialogControl = new AboutDialogControl();
-            return _host.ShowDialogAsync(aboutDialogControl, "About");
+            aboutDialogControl.DataContext = new AboutDialogViewModel();
+            return aboutDialogControl.ShowControlDialogAsync(_host, "About");
         }
     }
 }
diff --git a/MessageCommunicator.TestGui/ViewServices/_AboutDialog/AboutDialogViewModel.cs b/MessageCommunicator.TestGui/ViewServices/_AboutDialog/AboutDialogViewModel.cs
new file mode 100644
index 0000000..5f1f6aa
--- /dev/null
+++ b/MessageCommunicator.TestGui/ViewServices/_AboutDialog/AboutDialogViewModel.cs
@@ -0,0 +1,94 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Reactive;
+using System.Reflection;
+using System.Runtime.Versioning;
+using System.Text;
+using Avalonia.Controls;
+using ReactiveUI;
+
+namespace MessageCommunicator.TestGui.ViewServices
+{
+    public class AboutDialogViewModel : OwnViewModelBase
+    {
+        public string Name
+        {
+            get
+            {
+                var asmAttribute = Assembly.GetExecutingAssembly().GetCustomAttribute<AssemblyProductAttribute>();
+                return asmAttribute?.Product ?? string.Empty;
+            }
+        }
+
+        public string Version
+        {
+            get
+            {
+                var asmAttribute = Assembly.GetExecutingAssembly().GetCustomAttribute<AssemblyInformationalVersionAttribute>();
+                return asmAttribute?.InformationalVersion ?? string.Empty;
+            }
+        }
+
+        public string Description
+        {
+            get
+            {
+                var asmAttribute = Assembly.GetExecutingAssembly().GetCustomAttribute<AssemblyDescriptionAttribute>();
+                return asmAttribute?.Description ?? string.Empty;
+            }
+        }
+
+        public string Homepage
+        {
+            get => "https://github.com/RolandKoenig/MessageCommunicator";
+        }
+
+        public string Author
+        {
+            get
+            {
+                var asmAttribute = Assembly.GetExecutingAssembly().GetCustomAttribute<AssemblyCompanyAttribute>();
+                return asmAttribute?.Company ?? string.Empty;
+            }
+        }
+
+        public string Copyright
+        {
+            get
+            {
+                var asmAttribute = Assembly.GetExecutingAssembly().GetCustomAttribute<AssemblyCopyrightAttribute>();
+                return asmAttribute?.Copyright ?? string.Empty;
+            }
+        }
+
+        public string TargetFramework
+        {
+            get
+            {
+                var asmAttribute = Assembly.GetExecutingAssembly().GetCustomAttribute<TargetFrameworkAttribute>();
+                return asmAttribute?.FrameworkName ?? string.Empty;
+            }
+        }
+
+        public string AvaloniaVersion
+        {
+            get
+            {
+                var asmAttribute = typeof(Window).Assembly.GetCustomAttribute<AssemblyInformationalVersionAttribute>();
+                return asmAttribute?.InformationalVersion?? string.Empty;
+            }
+        }
+
+        [Browsable(false)]
+        public ReactiveCommand<Unit, Unit> Command_Close { get; }
+
+        [Browsable(false)]
+        public AboutDialogViewModel Self => this;
+
+        public AboutDialogViewModel()
+        {
+            this.Command_Close = ReactiveCommand.Create(() => this.CloseWindow(null));
+        }
+    }
+}
diff --git a/MessageCommunicator.TestGui/_Util/_View/DialogHostControl.cs b/MessageCommunicator.TestGui/_Util/_View/DialogHostControl.cs
index 460e580..ab8f118 100644
--- a/MessageCommunicator.TestGui/_Util/_View/DialogHostControl.cs
+++ b/MessageCommunicator.TestGui/_Util/_View/DialogHostControl.cs
@@ -38,11 +38,6 @@ public DialogHostControl()
         }
 
         public void ShowDialog(Control controlToShow, string headerText)
-        {
-            this.ShowDialogAsync(controlToShow, headerText);
-        }
-
-        public Task ShowDialogAsync(Control controlToShow, string headerText)
         {
             var currentChild = controlToShow;
             var currentChildInitialSize = new Size(currentChild.Width, currentChild.Height);
@@ -61,11 +56,9 @@ public Task ShowDialogAsync(Control controlToShow, string headerText)
             var currentBackground = new Grid();
             currentBackground.Background = _backgroundDialog;
 
-            var taskComplSource = new TaskCompletionSource<object?>();
             _children.Push(new ChildInfo(
                 currentChild, currentChildBorder, 
-                currentChildInitialSize, currentBackground,
-                taskComplSource));
+                currentChildInitialSize, currentBackground));
 
             this.Children.Add(currentBackground);
             this.Children.Add(borderControl);
@@ -77,8 +70,6 @@ public Task ShowDialogAsync(Control controlToShow, string headerText)
             }
 
             this.UpdateBorderSize();
-
-            return taskComplSource.Task;
         }
 
         public void CloseDialog()
@@ -89,7 +80,6 @@ public void CloseDialog()
             }
             this.Children.Remove(removedChild.ChildBorder);
             this.Children.Remove(removedChild.ChildBackground);
-            removedChild.TaskComplSource.TrySetResult(null);
 
             if (_children.Count == 0)
             {
@@ -169,21 +159,14 @@ public Size InitialSize
                 get;
             }
 
-            public TaskCompletionSource<object?> TaskComplSource
-            {
-                get;
-            }
-
             internal ChildInfo(
                 Control child, Control childBorder, 
-                Size initialSize, Grid childBackground,
-                TaskCompletionSource<object?> taskComplSource)
+                Size initialSize, Grid childBackground)
             {
                 this.Child = child;
                 this.ChildBorder = childBorder;
                 this.InitialSize = initialSize;
                 this.ChildBackground = childBackground;
-                this.TaskComplSource = taskComplSource;
             }
         }
     }
diff --git a/MessageCommunicator.TestGui/_Util/_View/_PropertyGrid/ConfigurablePropertyMetadata.cs b/MessageCommunicator.TestGui/_Util/_View/_PropertyGrid/ConfigurablePropertyMetadata.cs
index 5dd87d5..b3fef48 100644
--- a/MessageCommunicator.TestGui/_Util/_View/_PropertyGrid/ConfigurablePropertyMetadata.cs
+++ b/MessageCommunicator.TestGui/_Util/_View/_PropertyGrid/ConfigurablePropertyMetadata.cs
@@ -60,6 +60,12 @@ public PropertyValueType ValueType
             set;
         }
 
+        public bool IsReadOnly
+        {
+            get;
+            set;
+        }
+
         internal ConfigurablePropertyMetadata(PropertyDescriptor propertyInfo, object hostObject, IPropertyContractResolver? propertyContractResolver)
         {
             _descriptor = propertyInfo;
@@ -70,6 +76,7 @@ internal ConfigurablePropertyMetadata(PropertyDescriptor propertyInfo, object ho
             this.CategoryName = categoryAttrib?.Category ?? string.Empty;
 
             this.PropertyName = propertyInfo.Name;
+            this.IsReadOnly = propertyInfo.IsReadOnly;
 
             this.PropertyDisplayName = propertyInfo.Name;
             var displayNameAttrib = this.GetCustomAttribute<DisplayNameAttribute>();
diff --git a/MessageCommunicator.TestGui/_Util/_View/_PropertyGrid/PropertyGridEditControlFactory.cs b/MessageCommunicator.TestGui/_Util/_View/_PropertyGrid/PropertyGridEditControlFactory.cs
index bc78817..9334de2 100644
--- a/MessageCommunicator.TestGui/_Util/_View/_PropertyGrid/PropertyGridEditControlFactory.cs
+++ b/MessageCommunicator.TestGui/_Util/_View/_PropertyGrid/PropertyGridEditControlFactory.cs
@@ -6,6 +6,7 @@
 using Avalonia.Controls.Primitives;
 using Avalonia.Data;
 using Avalonia.Layout;
+using SharpDX.DXGI;
 
 namespace MessageCommunicator.TestGui
 {
@@ -44,6 +45,7 @@ public class PropertyGridEditControlFactory
                 default:
                     throw new ArgumentOutOfRangeException($"Unsupported value {property.ValueType}");
             }
+
             return ctrlValueEdit;
         }
 
@@ -56,6 +58,7 @@ protected virtual Control CreateCheckBoxControl(
                 nameof(property.ValueAccessor),
                 BindingMode.TwoWay);
             ctrlCheckBox.HorizontalAlignment = HorizontalAlignment.Left;
+            ctrlCheckBox.IsEnabled = !property.IsReadOnly;
             return ctrlCheckBox;
         }
 
@@ -68,6 +71,7 @@ protected virtual Control CreateTextBoxControl(
                 nameof(property.ValueAccessor),
                 BindingMode.TwoWay);
             ctrlTextBox.Width = double.NaN;
+            ctrlTextBox.IsReadOnly = property.IsReadOnly;
             return ctrlTextBox;
         }
 
@@ -81,6 +85,7 @@ protected virtual Control CreateEnumControl(
                 nameof(property.ValueAccessor),
                 BindingMode.TwoWay);
             ctrlComboBox.Width = double.NaN;
+            ctrlComboBox.IsEnabled = !property.IsReadOnly;
             return ctrlComboBox;
         }
 
@@ -99,6 +104,7 @@ protected virtual Control CreateEncodingWebNameControl(
                 nameof(property.ValueAccessor),
                 BindingMode.TwoWay);
             ctrlComboBoxEnc.Width = double.NaN;
+            ctrlComboBoxEnc.IsEnabled = !property.IsReadOnly;
 
             var ctrlEncDescLabel = new TextBlock();
             ctrlEncDescLabel[!TextBlock.TextProperty] = new Binding(
@@ -139,6 +145,7 @@ protected virtual Control CreateTextAndHexadecimalEditControl(
                 nameof(property.ValueAccessor),
                 BindingMode.TwoWay);
             ctrlTextBox1.Width = double.NaN;
+            ctrlTextBox1.IsReadOnly = property.IsReadOnly;
 
             var hexTextBinding = new Binding(
                 nameof(property.ValueAccessor),
@@ -160,6 +167,7 @@ protected virtual Control CreateTextAndHexadecimalEditControl(
             var ctrlTextBox2 = new TextBox();
             ctrlTextBox2[!TextBox.TextProperty] = hexTextBinding;
             ctrlTextBox2.Width = double.NaN;
+            ctrlTextBox2.IsReadOnly = property.IsReadOnly;
 
             otherProperty.RegisterWeakPropertyChangedTarget(
                 new WeakReference(ctrlTextBox2),