diff --git a/src/Avalonia.Controls/Flyouts/FlyoutBase.cs b/src/Avalonia.Controls/Flyouts/FlyoutBase.cs
index b874d149bf..d78ddd4169 100644
--- a/src/Avalonia.Controls/Flyouts/FlyoutBase.cs
+++ b/src/Avalonia.Controls/Flyouts/FlyoutBase.cs
@@ -22,7 +22,7 @@ namespace Avalonia.Controls.Primitives
         /// <summary>
         /// Defines the <see cref="IsOpen"/> property
         /// </summary>
-        private static readonly DirectProperty<FlyoutBase, bool> IsOpenProperty =
+        public static readonly DirectProperty<FlyoutBase, bool> IsOpenProperty =
            AvaloniaProperty.RegisterDirect<FlyoutBase, bool>(nameof(IsOpen),
                x => x.IsOpen);
 
diff --git a/src/Avalonia.Controls/Window.cs b/src/Avalonia.Controls/Window.cs
index 0ca28ca196..4c94b725ea 100644
--- a/src/Avalonia.Controls/Window.cs
+++ b/src/Avalonia.Controls/Window.cs
@@ -994,6 +994,7 @@ namespace Avalonia.Controls
 
         protected override void OnPropertyChanged<T>(AvaloniaPropertyChangedEventArgs<T> change)
         {
+            base.OnPropertyChanged(change);
             if (change.Property == SystemDecorationsProperty)
             {
                 var typedNewValue = change.NewValue.GetValueOrDefault<SystemDecorations>();