changed source of enum type to xaml,

removed titleMenuItem Entry, since it is not necessary,
renamed NewlineSeparator Selector to "Default"

MultiTerm.Core/ViewModel/ShellViewModel.cs

@@ -20,18 +20,13 @@ public partial class ShellViewModel : ObservableObject
     private ITerminalViewModel? selectedTerminalViewModel;
 
     #region Settings Menu Bar
-    public IEnumerable<NewlineSeparatorType> NewlineSeparatorTypeValues
-    {
-        get { return Enum.GetValues(typeof(NewlineSeparatorType)).Cast<NewlineSeparatorType>(); }
-    }
-
     // TODO Initialize from File
     [ObservableProperty]
-    private NewlineSeparatorType selectedReceiveNewlineSeparator = NewlineSeparatorType.None;
+    private NewlineSeparatorType defaultReceiveNewlineSeparator = NewlineSeparatorType.None;
 
     // TODO Initialize from File
     [ObservableProperty]
-    private NewlineSeparatorType selectedSendNewlineSeparator = NewlineSeparatorType.None;
+    private NewlineSeparatorType defaultSendNewlineSeparator = NewlineSeparatorType.None;
     #endregion
 
     public ShellViewModel(IAbstractFactory<SendReceiveViewModel> sendReceiveViewModelFactory)
@@ -53,12 +48,12 @@ public partial class ShellViewModel : ObservableObject
         this.SelectedTerminalViewModel = newTerminal;
     }
 
-    partial void OnSelectedReceiveNewlineSeparatorChanged(NewlineSeparatorType value)
+    partial void OnDefaultReceiveNewlineSeparatorChanged(NewlineSeparatorType value)
     {
         Console.WriteLine($"Changed to {value}");
     }
 
-    partial void OnSelectedSendNewlineSeparatorChanging(NewlineSeparatorType value)
+    partial void OnDefaultSendNewlineSeparatorChanged(NewlineSeparatorType value)
     {
         Console.WriteLine($"Changed Send to {value}");
     }
@@ -66,7 +61,7 @@ public partial class ShellViewModel : ObservableObject
     [RelayCommand]
     public void TestButtonClicked()
     {
-        this.SelectedReceiveNewlineSeparator = NewlineSeparatorType.CR_LF;
+        this.DefaultReceiveNewlineSeparator = NewlineSeparatorType.CR_LF;
     }
 
 }

MultiTerm.Wpf/Controls/SingleSelectSubMenu.cs

@@ -92,16 +92,15 @@ public class SingleSelectSubMenu : MenuItem
 
     /// <summary>
     /// Title Changed Handler.
-    /// Hides SingleSelectSubMenu main entry in ItemsCollection (Visibility Collapsed).
+    /// Disables SingleSelectSubMenu and sets header to title.
-    /// Sets the header of the SingleSelectSubMenu instance to the Title, which helps to identify sssm while debugging.
     /// </summary>
     private static void OnTitleChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
     {
         // extract instance and guard null
         if (d is not SingleSelectSubMenu sssm) { return; }
 
-        sssm.Visibility = Visibility.Collapsed;
         sssm.Header = sssm.Title;
+        sssm.IsEnabled = false;
     }
 
     /// <summary>
@@ -117,15 +116,6 @@ public class SingleSelectSubMenu : MenuItem
         // extract parent instance of SSSM and guard null
         if (sssm.Parent is not MenuItem parent) { return; }
 
-        // IMRPOVEMENT Delete currently associated values (using e.OldValue) from RegisteredSubItemsAndParent
-        // create and add title menu item
-        var titleMenuItem = new MenuItem
-        {
-            IsEnabled = false,
-            Header = sssm.Title
-        };
-        parent.Items.Add(titleMenuItem);
-
         // iterate through new OptionsSource Values and build up list of menuItems
         foreach (var item in (IEnumerable)e.NewValue)
         {

MultiTerm.Wpf/View/ShellView.xaml

@@ -3,7 +3,7 @@
              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:sys="clr-namespace:System;assembly=System.Core"
+             xmlns:sys="clr-namespace:System;assembly=mscorlib" 
              xmlns:conv="clr-namespace:MultiTerm.Wpf.ValueConverters"
              xmlns:controls="clr-namespace:MultiTerm.Wpf.Controls"
              xmlns:vm="clr-namespace:MultiTerm.Core.ViewModel;assembly=MultiTerm.Core"
@@ -15,6 +15,15 @@
         <!-- Value Converters -->
         <conv:EnumDescriptionToMenuItemConverter x:Key="EnumDescriptionConverter"/>
         
+        <!-- Data Sources -->
+        <ObjectDataProvider x:Key="NewlineSeparatorTypeValues"
+                        ObjectType="{x:Type sys:Enum}"
+                        MethodName="GetValues">
+            <ObjectDataProvider.MethodParameters>
+                <x:Type TypeName="core_common:NewlineSeparatorType" />
+            </ObjectDataProvider.MethodParameters>
+        </ObjectDataProvider>
+
     </UserControl.Resources>
 
     <DockPanel>
@@ -36,17 +45,13 @@
                 <MenuItem Header="Item1" Command="{Binding TestButtonClickedCommand}"/>
             </MenuItem>
             <MenuItem Header="_Settings">
-                <controls:SingleSelectSubMenu Title="Newline Separator (Receive)"
+                <controls:SingleSelectSubMenu Title="Default Newline Separator on Receive" HorizontalContentAlignment="Left" VerticalContentAlignment="Top"
-                          OptionsSource="{Binding NewlineSeparatorTypeValues}"
+                          OptionsSource="{Binding Source={StaticResource NewlineSeparatorTypeValues}}"
-                          SelectedMenuItem="{Binding SelectedReceiveNewlineSeparator, 
+                          SelectedMenuItem="{Binding DefaultReceiveNewlineSeparator, Mode=TwoWay, Converter={StaticResource EnumDescriptionConverter}}">
-                                                Mode=TwoWay,
-                                                Converter={StaticResource EnumDescriptionConverter}}">
                 </controls:SingleSelectSubMenu>
-                <controls:SingleSelectSubMenu Title="Newline Separator On Send"
+                <controls:SingleSelectSubMenu Title="Default Newline Separator on Send"
-                          OptionsSource="{Binding NewlineSeparatorTypeValues}"
+                          OptionsSource="{Binding Source={StaticResource NewlineSeparatorTypeValues}}"
-                          SelectedMenuItem="{Binding SelectedSendNewlineSeparator, 
+                          SelectedMenuItem="{Binding DefaultSendNewlineSeparator,Mode=TwoWay, Converter={StaticResource EnumDescriptionConverter}}">
-                                                Mode=TwoWay,
-                                                Converter={StaticResource EnumDescriptionConverter}}">
                 </controls:SingleSelectSubMenu>
             </MenuItem>
             <MenuItem Header="_View"/>