diff --git a/src/MvvmScarletToolkit.Incubator/MvvmScarletToolkit.Incubator.csproj b/src/MvvmScarletToolkit.Incubator/MvvmScarletToolkit.Incubator.csproj
index 231e3448..dc8a53a0 100644
--- a/src/MvvmScarletToolkit.Incubator/MvvmScarletToolkit.Incubator.csproj
+++ b/src/MvvmScarletToolkit.Incubator/MvvmScarletToolkit.Incubator.csproj
@@ -8,7 +8,7 @@
 
     <ItemGroup>
         <PackageReference Include="DynamicData" Version="7.4.3" />
-        <PackageReference Include="Microsoft.Xaml.Behaviors.Wpf" Version="1.1.37" />
+        <PackageReference Include="Microsoft.Xaml.Behaviors.Wpf" Version="1.1.39" />
         <PackageReference Include="System.Drawing.Common" Version="6.0.0" />
     </ItemGroup>
 
diff --git a/src/MvvmScarletToolkit.Wpf/Behaviors/MultiSelectionBehavior.cs b/src/MvvmScarletToolkit.Wpf/Behaviors/MultiSelectionBehavior.cs
index 6e4073c4..0b85ee7d 100644
--- a/src/MvvmScarletToolkit.Wpf/Behaviors/MultiSelectionBehavior.cs
+++ b/src/MvvmScarletToolkit.Wpf/Behaviors/MultiSelectionBehavior.cs
@@ -44,7 +44,7 @@ protected override void OnAttached()
         {
             base.OnAttached();
 
-            AssociatedObject.SelectionChanged += ListBoxSelectionChanged;
+            AssociatedObject.SelectionChanged += OnSelectionChanged;
 
             if (SelectedItems != null)
             {
@@ -62,13 +62,13 @@ protected override void OnAttached()
 
         protected override void OnDetaching()
         {
-            AssociatedObject.SelectionChanged -= ListBoxSelectionChanged;
+            AssociatedObject.SelectionChanged -= OnSelectionChanged;
             base.OnDetaching();
         }
 
         private static void OnSelectedItemsChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
         {
-            if (!(o is MultiSelectionBehavior behavior))
+            if (o is not MultiSelectionBehavior behavior)
             {
                 return;
             }
@@ -85,7 +85,7 @@ private static void OnSelectedItemsChanged(DependencyObject o, DependencyPropert
 
             if (e.NewValue is INotifyCollectionChanged newValue)
             {
-                if (e.OldValue != null) // skip setting the initial value from the UI(since thats an empty collection), as that will overwrite anything that has been set in the bound object
+                if (e.OldValue is not null) // skip setting the initial value from the UI(since thats an empty collection), as that will overwrite anything that has been set in the bound object
                 {
                     if (behavior.AssociatedObject.SelectedItems.Count > 0)
                     {
@@ -116,7 +116,7 @@ private void SourceCollectionChanged(object? sender, NotifyCollectionChangedEven
             {
                 _isUpdatingTarget = true;
 
-                if (e.OldItems != null)
+                if (e.OldItems is not null)
                 {
                     foreach (var item in e.OldItems)
                     {
@@ -124,7 +124,7 @@ private void SourceCollectionChanged(object? sender, NotifyCollectionChangedEven
                     }
                 }
 
-                if (e.NewItems != null)
+                if (e.NewItems is not null)
                 {
                     foreach (var item in e.NewItems)
                     {
@@ -143,13 +143,18 @@ private void SourceCollectionChanged(object? sender, NotifyCollectionChangedEven
             }
         }
 
-        private void ListBoxSelectionChanged(object? sender, SelectionChangedEventArgs e)
+        private void OnSelectionChanged(object? sender, SelectionChangedEventArgs e)
         {
             if (_isUpdatingTarget)
             {
                 return;
             }
 
+            if (!ReferenceEquals(e.OriginalSource, sender))
+            {
+                return;
+            }
+
             var selectedItems = SelectedItems;
             if (selectedItems is null)
             {