diff --git a/src/Gtk/Perspex.Gtk/WindowImpl.cs b/src/Gtk/Perspex.Gtk/WindowImpl.cs
index 1faab58bc2..1914207d08 100644
--- a/src/Gtk/Perspex.Gtk/WindowImpl.cs
+++ b/src/Gtk/Perspex.Gtk/WindowImpl.cs
@@ -16,7 +16,7 @@ namespace Perspex.Gtk
 
     public class WindowImpl : Gtk.Window, IWindowImpl
     {
-        private TopLevel _owner;
+        private IInputRoot _inputRoot;
 
         private IPlatformHandle _windowHandle;
 
@@ -105,9 +105,9 @@ namespace Perspex.Gtk
             return new Point(point.X + x, point.Y + y);
         }
 
-        public void SetOwner(TopLevel owner)
+        public void SetInputRoot(IInputRoot inputRoot)
         {
-            _owner = owner;
+            _inputRoot = inputRoot;
         }
 
         public void SetTitle(string title)
@@ -158,7 +158,7 @@ namespace Perspex.Gtk
             var e = new RawMouseEventArgs(
                 GtkMouseDevice.Instance,
                 evnt.Time,
-                _owner,
+                _inputRoot,
                 evnt.Button == 0
                     ? RawMouseEventType.LeftButtonDown
                     : evnt.Button == 1 ? RawMouseEventType.RightButtonDown : RawMouseEventType.MiddleButtonDown,
@@ -172,7 +172,7 @@ namespace Perspex.Gtk
             var e = new RawMouseEventArgs(
                 GtkMouseDevice.Instance,
                 evnt.Time,
-                _owner,
+                _inputRoot,
                 evnt.Button == 0
                     ? RawMouseEventType.LeftButtonUp
                     : evnt.Button == 1 ? RawMouseEventType.RightButtonUp : RawMouseEventType.MiddleButtonUp,
@@ -241,7 +241,7 @@ namespace Perspex.Gtk
             var e = new RawMouseEventArgs(
                 GtkMouseDevice.Instance,
                 evnt.Time,
-                _owner,
+                _inputRoot,
                 RawMouseEventType.Move,
                 position, GetModifierKeys(evnt.State));
             Input(e);
diff --git a/src/Perspex.Controls/Platform/ITopLevelImpl.cs b/src/Perspex.Controls/Platform/ITopLevelImpl.cs
index 116e029505..1cbc5f7c60 100644
--- a/src/Perspex.Controls/Platform/ITopLevelImpl.cs
+++ b/src/Perspex.Controls/Platform/ITopLevelImpl.cs
@@ -30,7 +30,7 @@ namespace Perspex.Platform
 
         void Invalidate(Rect rect);
 
-        void SetOwner(TopLevel owner);
+        void SetInputRoot(IInputRoot inputRoot);
 
         Point PointToScreen(Point point);
 
diff --git a/src/Perspex.Controls/TopLevel.cs b/src/Perspex.Controls/TopLevel.cs
index d6e3c37a75..82cfc0e03e 100644
--- a/src/Perspex.Controls/TopLevel.cs
+++ b/src/Perspex.Controls/TopLevel.cs
@@ -111,7 +111,7 @@ namespace Perspex.Controls
             LayoutManager = TryGetService<ILayoutManager>(dependencyResolver);
             _renderManager = TryGetService<IRenderManager>(dependencyResolver);
 
-            PlatformImpl.SetOwner(this);
+            PlatformImpl.SetInputRoot(this);
             PlatformImpl.Activated = HandleActivated;
             PlatformImpl.Deactivated = HandleDeactivated;
             PlatformImpl.Closed = HandleClosed;
diff --git a/src/Windows/Perspex.Win32/WindowImpl.cs b/src/Windows/Perspex.Win32/WindowImpl.cs
index 197f178fd8..fa3313c232 100644
--- a/src/Windows/Perspex.Win32/WindowImpl.cs
+++ b/src/Windows/Perspex.Win32/WindowImpl.cs
@@ -31,10 +31,12 @@ namespace Perspex.Win32
 
         private IntPtr _hwnd;
 
-        private TopLevel _owner;
+        private IInputRoot _owner;
 
         private bool _trackingMouse;
 
+        private bool _isActive;
+
         public WindowImpl()
         {
             CreateWindow();
@@ -163,9 +165,9 @@ namespace Perspex.Win32
             return new Point(p.X, p.Y);
         }
 
-        public void SetOwner(TopLevel owner)
+        public void SetInputRoot(IInputRoot inputRoot)
         {
-            _owner = owner;
+            _owner = inputRoot;
         }
 
         public void SetTitle(string title)
@@ -181,13 +183,13 @@ namespace Perspex.Win32
         public virtual IDisposable ShowDialog()
         {
             var disabled = s_instances.Where(x => x != this && x.IsEnabled).ToList();
-            TopLevel activated = null;
+            WindowImpl activated = null;
 
             foreach (var window in disabled)
             {
-                if (window._owner.IsActive)
+                if (window._isActive)
                 {
-                    activated = window._owner;
+                    activated = window;
                 }
 
                 window.IsEnabled = false;
@@ -253,6 +255,7 @@ namespace Perspex.Win32
                     {
                         case UnmanagedMethods.WindowActivate.WA_ACTIVE:
                         case UnmanagedMethods.WindowActivate.WA_CLICKACTIVE:
+                            _isActive = true;
                             if (Activated != null)
                             {
                                 Activated();
@@ -261,6 +264,7 @@ namespace Perspex.Win32
                             break;
 
                         case UnmanagedMethods.WindowActivate.WA_INACTIVE:
+                            _isActive = false;
                             if (Deactivated != null)
                             {
                                 Deactivated();