diff --git a/src/Dock.Avalonia/Controls/HostWindow.axaml b/src/Dock.Avalonia/Controls/HostWindow.axaml
index c9ca9cc00..d64af0d17 100644
--- a/src/Dock.Avalonia/Controls/HostWindow.axaml
+++ b/src/Dock.Avalonia/Controls/HostWindow.axaml
@@ -1,6 +1,7 @@
 <ResourceDictionary xmlns="https://github.com/avaloniaui"
                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-                    xmlns:core="using:Dock.Model.Core">
+                    xmlns:core="using:Dock.Model.Core"
+                    xmlns:controls="clr-namespace:Dock.Model.Controls;assembly=Dock.Model">
   <Design.PreviewWith>
     <HostWindow IsToolWindow="False" Width="300" Height="400" />
   </Design.PreviewWith>
@@ -14,6 +15,7 @@
     <Setter Property="WindowState" Value="Normal" />
     <Setter Property="UseLayoutRounding" Value="True" />
     <Setter Property="Title" Value="{Binding ActiveDockable.Title}" />
+    <Setter Property="Topmost" Value="{Binding Window.Topmost}" x:DataType="controls:IRootDock" />
     <Setter Property="SystemDecorations" Value="Full" />
     <Setter Property="ExtendClientAreaToDecorationsHint" Value="True" />
     <Setter Property="ExtendClientAreaChromeHints" Value="PreferSystemChrome" />
diff --git a/src/Dock.Avalonia/Controls/HostWindow.axaml.cs b/src/Dock.Avalonia/Controls/HostWindow.axaml.cs
index 5957bcd68..633ca2b7c 100644
--- a/src/Dock.Avalonia/Controls/HostWindow.axaml.cs
+++ b/src/Dock.Avalonia/Controls/HostWindow.axaml.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Linq;
 using System.Runtime.InteropServices;
 using Avalonia;
 using Avalonia.Controls;
@@ -6,6 +7,7 @@
 using Avalonia.Controls.Primitives;
 using Avalonia.Input;
 using Avalonia.Styling;
+using Avalonia.VisualTree;
 using Dock.Avalonia.Internal;
 using Dock.Model;
 using Dock.Model.Core;
@@ -276,7 +278,15 @@ public void Present(bool isDialog)
                     Window.Factory?.OnWindowOpened(Window);
                 }
 
-                Show();
+                var ownerDockControl = Window?.Layout?.Factory?.DockControls.FirstOrDefault();
+                if (ownerDockControl is Control control && control.GetVisualRoot() is Window parentWindow)
+                {
+                    Show(parentWindow);
+                }
+                else
+                {
+                    Show();
+                }
             }
         }
     }
@@ -334,12 +344,6 @@ public void GetSize(out double width, out double height)
         height = Height;
     }
 
-    /// <inheritdoc/>
-    public void SetTopmost(bool topmost)
-    {
-        Topmost = topmost;
-    }
-
     /// <inheritdoc/>
     public void SetTitle(string title)
     {
diff --git a/src/Dock.Model/Adapters/HostAdapter.cs b/src/Dock.Model/Adapters/HostAdapter.cs
index 7cdee8287..3baf45227 100644
--- a/src/Dock.Model/Adapters/HostAdapter.cs
+++ b/src/Dock.Model/Adapters/HostAdapter.cs
@@ -56,7 +56,6 @@ public void Present(bool isDialog)
             _window.Host.Present(isDialog);
             _window.Host.SetPosition(_window.X, _window.Y);
             _window.Host.SetSize(_window.Width, _window.Height);
-            _window.Host.SetTopmost(_window.Topmost);
             _window.Host.SetTitle(_window.Title);
             _window.Host.SetLayout(_window.Layout);
             _window.Host.IsTracked = true;
diff --git a/src/Dock.Model/Core/IHostWindow.cs b/src/Dock.Model/Core/IHostWindow.cs
index ffaff405f..eef221c7d 100644
--- a/src/Dock.Model/Core/IHostWindow.cs
+++ b/src/Dock.Model/Core/IHostWindow.cs
@@ -64,12 +64,6 @@ public interface IHostWindow
     /// <param name="height">The host height.</param>
     void GetSize(out double width, out double height);
 
-    /// <summary>
-    /// Sets host topmost.
-    /// </summary>
-    /// <param name="topmost">The host topmost.</param>
-    void SetTopmost(bool topmost);
-
     /// <summary>
     /// Sets host title.
     /// </summary>
diff --git a/src/Dock.Model/FactoryBase.Dockable.cs b/src/Dock.Model/FactoryBase.Dockable.cs
index 375db2165..c987ef63b 100644
--- a/src/Dock.Model/FactoryBase.Dockable.cs
+++ b/src/Dock.Model/FactoryBase.Dockable.cs
@@ -254,7 +254,7 @@ public virtual void SwapDockable(IDock sourceDock, IDock targetDock, IDockable s
             var originalTargetDockable = targetDock.VisibleDockables[targetIndex];
             sourceDock.VisibleDockables[sourceIndex] = originalTargetDockable;
             targetDock.VisibleDockables[targetIndex] = originalSourceDockable;
-                
+
             InitDockable(originalSourceDockable, targetDock);
             InitDockable(originalTargetDockable, sourceDock);
 
@@ -371,7 +371,7 @@ public virtual void PinDockable(IDockable dockable)
                 {
                     return;
                 }
-                
+
                 var isVisible = false;
 
                 if (toolDock.VisibleDockables is not null)
@@ -413,7 +413,7 @@ public virtual void PinDockable(IDockable dockable)
                             break;
                         }
                     }
-                    
+
                     if (toolDock.VisibleDockables is not null)
                     {
                         RemoveVisibleDockable(toolDock, dockable);
@@ -531,8 +531,9 @@ public virtual void PinDockable(IDockable dockable)
                         HidePreviewingDockables(rootDock);
                         AddVisibleDockable(originalOwner, dockable);
                     }
+
                     OnDockableAdded(dockable);
-                    
+
                     // TODO: Handle ActiveDockable state.
                     // TODO: Handle IsExpanded property of IToolDock.
                     // TODO: Handle AutoHide property of IToolDock.
@@ -604,7 +605,7 @@ public virtual void FloatDockable(IDockable dockable)
     /// <inheritdoc/>
     public virtual void CloseDockable(IDockable dockable)
     {
-        if (dockable.OnClose())
+        if (dockable.CanClose && dockable.OnClose())
         {
             RemoveDockable(dockable, true);
             OnDockableClosed(dockable);
@@ -662,7 +663,7 @@ public virtual void CloseLeftDockables(IDockable dockable)
         {
             return;
         }
-            
+
         CloseDockablesRange(dock, 0, indexOf - 1);
     }
 
@@ -679,7 +680,7 @@ public virtual void CloseRightDockables(IDockable dockable)
         {
             return;
         }
-            
+
         CloseDockablesRange(dock, indexOf + 1, dock.VisibleDockables.Count - 1);
     }
 
diff --git a/src/Dock.Model/FactoryBase.cs b/src/Dock.Model/FactoryBase.cs
index 442495695..9b21cfd16 100644
--- a/src/Dock.Model/FactoryBase.cs
+++ b/src/Dock.Model/FactoryBase.cs
@@ -255,7 +255,6 @@ public virtual void SplitToDock(IDock dock, IDockable dockable, DockOperation op
     public virtual IDockWindow? CreateWindowFrom(IDockable dockable)
     {
         IDockable? target;
-        bool topmost;
 
         switch (dockable)
         {
@@ -273,7 +272,6 @@ public virtual void SplitToDock(IDock dock, IDockable dockable, DockOperation op
                         dock.ActiveDockable = dockable;
                     }
                 }
-                topmost = true;
                 break;
             }
             case IDocument:
@@ -305,37 +303,31 @@ public virtual void SplitToDock(IDock dock, IDockable dockable, DockOperation op
                         dock.ActiveDockable = dockable;
                     }
                 }
-                topmost = false;
                 break;
             }
             case IToolDock:
             {
                 target = dockable;
-                topmost = true;
                 break;
             }
             case IDocumentDock:
             {
                 target = dockable;
-                topmost = false;
                 break;
             }
             case IProportionalDock proportionalDock:
             {
                 target = proportionalDock;
-                topmost = false;
                 break;
             }
             case IDockDock dockDock:
             {
                 target = dockDock;
-                topmost = false;
                 break;
             }
             case IRootDock rootDock:
             {
                 target = rootDock.ActiveDockable;
-                topmost = false;
                 break;
             }
             default:
@@ -361,7 +353,6 @@ public virtual void SplitToDock(IDock dock, IDockable dockable, DockOperation op
         window.Title = "";
         window.Width = double.NaN;
         window.Height = double.NaN;
-        window.Topmost = topmost;
         window.Layout = root;
 
         root.Window = window;