diff --git a/src/Android/Avalonia.Android/AndroidPlatform.cs b/src/Android/Avalonia.Android/AndroidPlatform.cs
index c11cadfbac..2e6f4a67c3 100644
--- a/src/Android/Avalonia.Android/AndroidPlatform.cs
+++ b/src/Android/Avalonia.Android/AndroidPlatform.cs
@@ -67,7 +67,7 @@ namespace Avalonia.Android
             throw new NotSupportedException();
         }
 
-        public IEmbeddableWindowImpl CreateEmbeddableWindow()
+        public IWindowImpl CreateEmbeddableWindow()
         {
             throw new NotSupportedException();
         }
diff --git a/src/Android/Avalonia.Android/AvaloniaView.cs b/src/Android/Avalonia.Android/AvaloniaView.cs
index fbe027db00..72732a1f95 100644
--- a/src/Android/Avalonia.Android/AvaloniaView.cs
+++ b/src/Android/Avalonia.Android/AvaloniaView.cs
@@ -33,10 +33,8 @@ namespace Avalonia.Android
             return _view.View.DispatchKeyEvent(e);
         }
 
-        class ViewImpl : TopLevelImpl, IEmbeddableWindowImpl
+        class ViewImpl : TopLevelImpl
         {
-            public event Action LostFocus;
-
             public ViewImpl(Context context) : base(context)
             {
                 View.Focusable = true;
diff --git a/src/Android/Avalonia.Android/Platform/SkiaPlatform/TopLevelImpl.cs b/src/Android/Avalonia.Android/Platform/SkiaPlatform/TopLevelImpl.cs
index 71706676d6..69fd2a9f13 100644
--- a/src/Android/Avalonia.Android/Platform/SkiaPlatform/TopLevelImpl.cs
+++ b/src/Android/Avalonia.Android/Platform/SkiaPlatform/TopLevelImpl.cs
@@ -194,6 +194,8 @@ namespace Avalonia.Android.Platform.SkiaPlatform
         }
 
         public IPopupImpl CreatePopup() => null;
+        
+        public Action LostFocus { get; set; }
 
         ILockedFramebuffer IFramebufferPlatformSurface.Lock()=>new AndroidFramebuffer(_view.Holder.Surface);
     }
diff --git a/src/Avalonia.Controls/Embedding/EmbeddableControlRoot.cs b/src/Avalonia.Controls/Embedding/EmbeddableControlRoot.cs
index 2d48a7d33b..8a21d7aa4b 100644
--- a/src/Avalonia.Controls/Embedding/EmbeddableControlRoot.cs
+++ b/src/Avalonia.Controls/Embedding/EmbeddableControlRoot.cs
@@ -10,7 +10,7 @@ namespace Avalonia.Controls.Embedding
 {
     public class EmbeddableControlRoot : TopLevel, IStyleable, IFocusScope, IDisposable
     {
-        public EmbeddableControlRoot(IEmbeddableWindowImpl impl) : base(impl)
+        public EmbeddableControlRoot(ITopLevelImpl impl) : base(impl)
         {
             
         }
@@ -19,9 +19,6 @@ namespace Avalonia.Controls.Embedding
         {
         }
 
-        [CanBeNull]
-        public new IEmbeddableWindowImpl PlatformImpl => (IEmbeddableWindowImpl) base.PlatformImpl;
-
         protected bool EnforceClientSize { get; set; } = true;
 
         public void Prepare()
diff --git a/src/Avalonia.Controls/Embedding/Offscreen/OffscreenTopLevelImpl.cs b/src/Avalonia.Controls/Embedding/Offscreen/OffscreenTopLevelImpl.cs
index 29f0374301..57e96f18bf 100644
--- a/src/Avalonia.Controls/Embedding/Offscreen/OffscreenTopLevelImpl.cs
+++ b/src/Avalonia.Controls/Embedding/Offscreen/OffscreenTopLevelImpl.cs
@@ -60,6 +60,7 @@ namespace Avalonia.Controls.Embedding.Offscreen
         }
 
         public Action Closed { get; set; }
+        public Action LostFocus { get; set; }
         public abstract IMouseDevice MouseDevice { get; }
         public IPopupImpl CreatePopup() => null;
     }
diff --git a/src/Avalonia.Controls/Platform/DefaultMenuInteractionHandler.cs b/src/Avalonia.Controls/Platform/DefaultMenuInteractionHandler.cs
index ccee811b2e..bbe9d73304 100644
--- a/src/Avalonia.Controls/Platform/DefaultMenuInteractionHandler.cs
+++ b/src/Avalonia.Controls/Platform/DefaultMenuInteractionHandler.cs
@@ -67,8 +67,8 @@ namespace Avalonia.Controls.Platform
                 window.Deactivated += WindowDeactivated;
             }
 
-            if (_root is TopLevel tl && tl.PlatformImpl is IEmbeddableWindowImpl eimpl)
-                eimpl.LostFocus += TopLevelLostPlatformFocus;
+            if (_root is TopLevel tl)
+                tl.PlatformImpl.LostFocus += TopLevelLostPlatformFocus;
 
             _inputManagerSubscription = InputManager?.Process.Subscribe(RawInput);
         }
@@ -100,8 +100,8 @@ namespace Avalonia.Controls.Platform
                 root.Deactivated -= WindowDeactivated;
             }
             
-            if (_root is TopLevel tl && tl.PlatformImpl is IEmbeddableWindowImpl eimpl)
-                eimpl.LostFocus -= TopLevelLostPlatformFocus;
+            if (_root is TopLevel tl)
+                tl.PlatformImpl.LostFocus -= TopLevelLostPlatformFocus;
 
             _inputManagerSubscription?.Dispose();
 
diff --git a/src/Avalonia.Controls/Platform/IEmbeddableWindowImpl.cs b/src/Avalonia.Controls/Platform/IEmbeddableWindowImpl.cs
deleted file mode 100644
index e2d174d9b6..0000000000
--- a/src/Avalonia.Controls/Platform/IEmbeddableWindowImpl.cs
+++ /dev/null
@@ -1,12 +0,0 @@
-using System;
-
-namespace Avalonia.Platform
-{
-    /// <summary>
-    /// Defines a platform-specific embeddable window implementation.
-    /// </summary>
-    public interface IEmbeddableWindowImpl : ITopLevelImpl
-    {
-        event Action LostFocus;
-    }
-}
diff --git a/src/Avalonia.Controls/Platform/ITopLevelImpl.cs b/src/Avalonia.Controls/Platform/ITopLevelImpl.cs
index 98ee17ee1f..eaba3ac895 100644
--- a/src/Avalonia.Controls/Platform/ITopLevelImpl.cs
+++ b/src/Avalonia.Controls/Platform/ITopLevelImpl.cs
@@ -98,6 +98,11 @@ namespace Avalonia.Platform
         /// Gets or sets a method called when the underlying implementation is destroyed.
         /// </summary>
         Action Closed { get; set; }
+        
+        /// <summary>
+        /// Gets or sets a method called when the input focus is lost.
+        /// </summary>
+        Action LostFocus { get; set; }
 
         /// <summary>
         /// Gets a mouse device associated with toplevel
diff --git a/src/Avalonia.Controls/Platform/IWindowingPlatform.cs b/src/Avalonia.Controls/Platform/IWindowingPlatform.cs
index a55bd63c6a..be8939e19a 100644
--- a/src/Avalonia.Controls/Platform/IWindowingPlatform.cs
+++ b/src/Avalonia.Controls/Platform/IWindowingPlatform.cs
@@ -3,6 +3,6 @@ namespace Avalonia.Platform
     public interface IWindowingPlatform
     {
         IWindowImpl CreateWindow();
-        IEmbeddableWindowImpl CreateEmbeddableWindow();
+        IWindowImpl CreateEmbeddableWindow();
     }
 }
diff --git a/src/Avalonia.Controls/Platform/PlatformManager.cs b/src/Avalonia.Controls/Platform/PlatformManager.cs
index ef453274b8..19d034b4e2 100644
--- a/src/Avalonia.Controls/Platform/PlatformManager.cs
+++ b/src/Avalonia.Controls/Platform/PlatformManager.cs
@@ -34,7 +34,7 @@ namespace Avalonia.Controls.Platform
             return s_designerMode ? (IWindowImpl)platform.CreateEmbeddableWindow() : platform.CreateWindow();
         }
 
-        public static IEmbeddableWindowImpl CreateEmbeddableWindow()
+        public static IWindowImpl CreateEmbeddableWindow()
         {
             var platform = AvaloniaLocator.Current.GetService<IWindowingPlatform>();
             if (platform == null)
diff --git a/src/Avalonia.Controls/Primitives/Popup.cs b/src/Avalonia.Controls/Primitives/Popup.cs
index 685271263f..a4a9707625 100644
--- a/src/Avalonia.Controls/Primitives/Popup.cs
+++ b/src/Avalonia.Controls/Primitives/Popup.cs
@@ -265,8 +265,7 @@ namespace Avalonia.Controls.Primitives
                     (x, handler) => x.Deactivated += handler,
                     (x, handler) => x.Deactivated -= handler));
                 
-                if (window.PlatformImpl is IEmbeddableWindowImpl reportsFocus)
-                    DeferCleanup(SubscribeToEventHandler<IEmbeddableWindowImpl, Action>(reportsFocus, WindowLostFocus,
+                DeferCleanup(SubscribeToEventHandler<IWindowImpl, Action>(window.PlatformImpl, WindowLostFocus,
                         (x, handler) => x.LostFocus += handler,
                         (x, handler) => x.LostFocus -= handler));
             }
diff --git a/src/Avalonia.Controls/Remote/RemoteServer.cs b/src/Avalonia.Controls/Remote/RemoteServer.cs
index e116316904..4f5a7cd311 100644
--- a/src/Avalonia.Controls/Remote/RemoteServer.cs
+++ b/src/Avalonia.Controls/Remote/RemoteServer.cs
@@ -10,13 +10,13 @@ namespace Avalonia.Controls.Remote
     {
         private EmbeddableControlRoot _topLevel;
 
-        class EmbeddableRemoteServerTopLevelImpl : RemoteServerTopLevelImpl, IEmbeddableWindowImpl
+        class EmbeddableRemoteServerTopLevelImpl : RemoteServerTopLevelImpl
         {
             public EmbeddableRemoteServerTopLevelImpl(IAvaloniaRemoteTransportConnection transport) : base(transport)
             {
             }
 #pragma warning disable 67
-            public event Action LostFocus;
+            public Action LostFocus { get; set; }
 
         }
         
diff --git a/src/Avalonia.Controls/TopLevel.cs b/src/Avalonia.Controls/TopLevel.cs
index 7acdcf71f0..315603e7c4 100644
--- a/src/Avalonia.Controls/TopLevel.cs
+++ b/src/Avalonia.Controls/TopLevel.cs
@@ -136,8 +136,7 @@ namespace Avalonia.Controls
                     this);
             }
 
-            if (impl is IEmbeddableWindowImpl embeddableWindowImpl)
-                embeddableWindowImpl.LostFocus += PlatformImpl_LostFocus;
+            impl.LostFocus += PlatformImpl_LostFocus;
         }
 
         /// <summary>
diff --git a/src/Avalonia.DesignerSupport/Remote/PreviewerWindowImpl.cs b/src/Avalonia.DesignerSupport/Remote/PreviewerWindowImpl.cs
index 7480b3519c..e50a6b264c 100644
--- a/src/Avalonia.DesignerSupport/Remote/PreviewerWindowImpl.cs
+++ b/src/Avalonia.DesignerSupport/Remote/PreviewerWindowImpl.cs
@@ -10,7 +10,7 @@ using Avalonia.Threading;
 
 namespace Avalonia.DesignerSupport.Remote
 {
-    class PreviewerWindowImpl : RemoteServerTopLevelImpl, IWindowImpl, IEmbeddableWindowImpl
+    class PreviewerWindowImpl : RemoteServerTopLevelImpl, IWindowImpl
     {
         private readonly IAvaloniaRemoteTransportConnection _transport;
 
@@ -45,11 +45,6 @@ namespace Avalonia.DesignerSupport.Remote
         public WindowState WindowState { get; set; }
         public Action<WindowState> WindowStateChanged { get; set; }
         public Size MaxClientSize { get; } = new Size(4096, 4096);
-        public event Action LostFocus
-        {
-            add {}
-            remove {}
-        }
 
         protected override void OnMessage(IAvaloniaRemoteTransportConnection transport, object obj)
         {
diff --git a/src/Avalonia.DesignerSupport/Remote/PreviewerWindowingPlatform.cs b/src/Avalonia.DesignerSupport/Remote/PreviewerWindowingPlatform.cs
index dcfcd42c04..fe4c580bbb 100644
--- a/src/Avalonia.DesignerSupport/Remote/PreviewerWindowingPlatform.cs
+++ b/src/Avalonia.DesignerSupport/Remote/PreviewerWindowingPlatform.cs
@@ -19,7 +19,7 @@ namespace Avalonia.DesignerSupport.Remote
         
         public IWindowImpl CreateWindow() => new WindowStub();
 
-        public IEmbeddableWindowImpl CreateEmbeddableWindow()
+        public IWindowImpl CreateEmbeddableWindow()
         {
             if (s_lastWindow != null)
             {
diff --git a/src/Avalonia.DesignerSupport/Remote/Stubs.cs b/src/Avalonia.DesignerSupport/Remote/Stubs.cs
index 82950ce53b..692f6a23b0 100644
--- a/src/Avalonia.DesignerSupport/Remote/Stubs.cs
+++ b/src/Avalonia.DesignerSupport/Remote/Stubs.cs
@@ -29,6 +29,7 @@ namespace Avalonia.DesignerSupport.Remote
         public Action<double> ScalingChanged { get; set; }
         public Func<bool> Closing { get; set; }
         public Action Closed { get; set; }
+        public Action LostFocus { get; set; }
         public IMouseDevice MouseDevice { get; } = new MouseDevice();
         public IPopupImpl CreatePopup() => new WindowStub(this);
 
diff --git a/src/Avalonia.Native/AvaloniaNativePlatform.cs b/src/Avalonia.Native/AvaloniaNativePlatform.cs
index f1be2285d8..a6ae072281 100644
--- a/src/Avalonia.Native/AvaloniaNativePlatform.cs
+++ b/src/Avalonia.Native/AvaloniaNativePlatform.cs
@@ -112,7 +112,7 @@ namespace Avalonia.Native
             return new WindowImpl(_factory, _options, _glFeature);
         }
 
-        public IEmbeddableWindowImpl CreateEmbeddableWindow()
+        public IWindowImpl CreateEmbeddableWindow()
         {
             throw new NotImplementedException();
         }
diff --git a/src/Avalonia.Native/WindowImplBase.cs b/src/Avalonia.Native/WindowImplBase.cs
index 64d7581c65..2ab436714b 100644
--- a/src/Avalonia.Native/WindowImplBase.cs
+++ b/src/Avalonia.Native/WindowImplBase.cs
@@ -43,8 +43,7 @@ namespace Avalonia.Native
     }
 
     public abstract class WindowBaseImpl : IWindowBaseImpl,
-        IFramebufferPlatformSurface, ITopLevelImplWithNativeControlHost,
-        IEmbeddableWindowImpl
+        IFramebufferPlatformSurface, ITopLevelImplWithNativeControlHost
     {
         IInputRoot _inputRoot;
         IAvnWindowBase _native;
@@ -122,7 +121,7 @@ namespace Avalonia.Native
             }, (int)w, (int)h, new Vector(dpi, dpi));
         }
 
-        public event Action LostFocus;
+        public Action LostFocus { get; set; }
         
         public Action<Rect> Paint { get; set; }
         public Action<Size> Resized { get; set; }
diff --git a/src/Avalonia.X11/X11Platform.cs b/src/Avalonia.X11/X11Platform.cs
index cd30b360d7..8e888a6bec 100644
--- a/src/Avalonia.X11/X11Platform.cs
+++ b/src/Avalonia.X11/X11Platform.cs
@@ -83,7 +83,7 @@ namespace Avalonia.X11
             return new X11Window(this, null);
         }
 
-        public IEmbeddableWindowImpl CreateEmbeddableWindow()
+        public IWindowImpl CreateEmbeddableWindow()
         {
             throw new NotSupportedException();
         }
diff --git a/src/Avalonia.X11/X11Window.cs b/src/Avalonia.X11/X11Window.cs
index be8c66fc9c..f531e301e0 100644
--- a/src/Avalonia.X11/X11Window.cs
+++ b/src/Avalonia.X11/X11Window.cs
@@ -310,6 +310,7 @@ namespace Avalonia.X11
         public Action<WindowState> WindowStateChanged { get; set; }
         public Action Closed { get; set; }
         public Action<PixelPoint> PositionChanged { get; set; }
+        public Action LostFocus { get; set; }
 
         public IRenderer CreateRenderer(IRenderRoot root)
         {
diff --git a/src/Linux/Avalonia.LinuxFramebuffer/FramebufferToplevelImpl.cs b/src/Linux/Avalonia.LinuxFramebuffer/FramebufferToplevelImpl.cs
index 9844cdc03b..29ad19aa24 100644
--- a/src/Linux/Avalonia.LinuxFramebuffer/FramebufferToplevelImpl.cs
+++ b/src/Linux/Avalonia.LinuxFramebuffer/FramebufferToplevelImpl.cs
@@ -9,7 +9,7 @@ using Avalonia.Rendering;
 
 namespace Avalonia.LinuxFramebuffer
 {
-    class FramebufferToplevelImpl : IEmbeddableWindowImpl, IScreenInfoProvider
+    class FramebufferToplevelImpl : ITopLevelImpl, IScreenInfoProvider
     {
         private readonly IOutputBackend _outputBackend;
         private readonly IInputBackend _inputBackend;
@@ -71,11 +71,7 @@ namespace Avalonia.LinuxFramebuffer
         public Action<Size> Resized { get; set; }
         public Action<double> ScalingChanged { get; set; }
         public Action Closed { get; set; }
-        public event Action LostFocus
-        {
-            add {}
-            remove {}
-        }
+        public Action LostFocus { get; set; }
 
         public Size ScaledSize => _outputBackend.PixelSize.ToSize(Scaling);
     }
diff --git a/src/Windows/Avalonia.Win32/Win32Platform.cs b/src/Windows/Avalonia.Win32/Win32Platform.cs
index c01bc8e16d..e9315990a2 100644
--- a/src/Windows/Avalonia.Win32/Win32Platform.cs
+++ b/src/Windows/Avalonia.Win32/Win32Platform.cs
@@ -204,7 +204,7 @@ namespace Avalonia.Win32
             return new WindowImpl();
         }
 
-        public IEmbeddableWindowImpl CreateEmbeddableWindow()
+        public IWindowImpl CreateEmbeddableWindow()
         {
             var embedded = new EmbeddedWindowImpl();
             embedded.Show();
diff --git a/src/Windows/Avalonia.Win32/WindowImpl.cs b/src/Windows/Avalonia.Win32/WindowImpl.cs
index 98210c6959..364b0ec139 100644
--- a/src/Windows/Avalonia.Win32/WindowImpl.cs
+++ b/src/Windows/Avalonia.Win32/WindowImpl.cs
@@ -19,8 +19,7 @@ namespace Avalonia.Win32
     /// Window implementation for Win32 platform.
     /// </summary>
     public partial class WindowImpl : IWindowImpl, EglGlPlatformSurface.IEglWindowGlPlatformSurfaceInfo,
-        ITopLevelImplWithNativeControlHost,
-        IEmbeddableWindowImpl
+        ITopLevelImplWithNativeControlHost
     {
         private static readonly List<WindowImpl> s_instances = new List<WindowImpl>();
 
@@ -126,7 +125,7 @@ namespace Avalonia.Win32
 
         public Action<WindowState> WindowStateChanged { get; set; }
         
-        public event Action LostFocus;
+        public Action LostFocus { get; set; }
 
         public Thickness BorderThickness
         {
diff --git a/src/iOS/Avalonia.iOS/EmbeddableImpl.cs b/src/iOS/Avalonia.iOS/EmbeddableImpl.cs
index 838bf49846..d299ff99c1 100644
--- a/src/iOS/Avalonia.iOS/EmbeddableImpl.cs
+++ b/src/iOS/Avalonia.iOS/EmbeddableImpl.cs
@@ -4,7 +4,7 @@ using Avalonia.Platform;
 
 namespace Avalonia.iOS
 {
-    class EmbeddableImpl : TopLevelImpl, IEmbeddableWindowImpl
+    class EmbeddableImpl : TopLevelImpl
     {
         public void SetTitle(string title)
         {
@@ -23,11 +23,5 @@ namespace Avalonia.iOS
         public void SetSystemDecorations(SystemDecorations enabled)
         {
         }
-
-        public event Action LostFocus
-        {
-            add {}
-            remove {}
-        }
     }
 }
diff --git a/src/iOS/Avalonia.iOS/TopLevelImpl.cs b/src/iOS/Avalonia.iOS/TopLevelImpl.cs
index c5b6642982..83a68990d7 100644
--- a/src/iOS/Avalonia.iOS/TopLevelImpl.cs
+++ b/src/iOS/Avalonia.iOS/TopLevelImpl.cs
@@ -139,5 +139,7 @@ namespace Avalonia.iOS
         public ILockedFramebuffer Lock() => new EmulatedFramebuffer(this);
 
         public IPopupImpl CreatePopup() => null;
+        
+        public Action LostFocus { get; set; }
     }
 }
diff --git a/src/iOS/Avalonia.iOS/WindowingPlatformImpl.cs b/src/iOS/Avalonia.iOS/WindowingPlatformImpl.cs
index 9a40b7162e..aaca5f53d6 100644
--- a/src/iOS/Avalonia.iOS/WindowingPlatformImpl.cs
+++ b/src/iOS/Avalonia.iOS/WindowingPlatformImpl.cs
@@ -10,7 +10,7 @@ namespace Avalonia.iOS
             throw new NotSupportedException();
         }
 
-        public IEmbeddableWindowImpl CreateEmbeddableWindow()
+        public WindowImpl CreateEmbeddableWindow()
         {
             throw new NotSupportedException();
         }
diff --git a/tests/Avalonia.Controls.UnitTests/WindowingPlatformMock.cs b/tests/Avalonia.Controls.UnitTests/WindowingPlatformMock.cs
index a9c991b8b9..25e8c82b1a 100644
--- a/tests/Avalonia.Controls.UnitTests/WindowingPlatformMock.cs
+++ b/tests/Avalonia.Controls.UnitTests/WindowingPlatformMock.cs
@@ -20,11 +20,11 @@ namespace Avalonia.Controls.UnitTests
             return _windowImpl?.Invoke() ?? Mock.Of<IWindowImpl>(x => x.Scaling == 1);
         }
 
-        public IEmbeddableWindowImpl CreateEmbeddableWindow()
+        public IWindowImpl CreateEmbeddableWindow()
         {
             throw new NotImplementedException();
         }
 
         public IPopupImpl CreatePopup() => _popupImpl?.Invoke() ?? Mock.Of<IPopupImpl>(x => x.Scaling == 1);
     }
-}
\ No newline at end of file
+}
diff --git a/tests/Avalonia.UnitTests/MockWindowingPlatform.cs b/tests/Avalonia.UnitTests/MockWindowingPlatform.cs
index b3e4b4edbc..a525eed7d3 100644
--- a/tests/Avalonia.UnitTests/MockWindowingPlatform.cs
+++ b/tests/Avalonia.UnitTests/MockWindowingPlatform.cs
@@ -116,7 +116,7 @@ namespace Avalonia.UnitTests
             }
         }
 
-        public IEmbeddableWindowImpl CreateEmbeddableWindow()
+        public IWindowImpl CreateEmbeddableWindow()
         {
             throw new NotImplementedException();
         }