diff --git a/native/Avalonia.Native/inc/avalonia-native.h b/native/Avalonia.Native/inc/avalonia-native.h
index 22247df9b2..6800ff7d68 100644
--- a/native/Avalonia.Native/inc/avalonia-native.h
+++ b/native/Avalonia.Native/inc/avalonia-native.h
@@ -278,6 +278,7 @@ AVNCOM(IAvnWindow, 04) : virtual IAvnWindowBase
     virtual HRESULT SetTitleBarColor (AvnColor color) = 0;
     virtual HRESULT SetWindowState(AvnWindowState state) = 0;
     virtual HRESULT GetWindowState(AvnWindowState*ret) = 0;
+    virtual HRESULT TakeFocusFromChildren() = 0;
 };
 
 AVNCOM(IAvnWindowBaseEvents, 05) : IUnknown
diff --git a/native/Avalonia.Native/src/OSX/window.mm b/native/Avalonia.Native/src/OSX/window.mm
index 86b3584681..7f8a6e1393 100644
--- a/native/Avalonia.Native/src/OSX/window.mm
+++ b/native/Avalonia.Native/src/OSX/window.mm
@@ -116,10 +116,15 @@ public:
         {
             SetPosition(lastPositionSet);
             UpdateStyle();
-            
-            [Window makeKeyAndOrderFront:Window];
-            [NSApp activateIgnoringOtherApps:YES];
-            
+            if(ShouldTakeFocusOnShow())
+            {
+                [Window makeKeyAndOrderFront:Window];
+                [NSApp activateIgnoringOtherApps:YES];
+            }
+            else
+            {
+                [Window orderFront: Window];
+            }
             [Window setTitle:_lastTitle];
             
             _shown = true;
@@ -128,6 +133,11 @@ public:
         }
     }
     
+    virtual bool ShouldTakeFocusOnShow()
+    {
+        return true;
+    }
+    
     virtual HRESULT Hide () override
     {
         @autoreleasepool
@@ -774,6 +784,15 @@ private:
         }
     }
     
+    virtual HRESULT TakeFocusFromChildren () override
+    {
+        if(Window == nil)
+            return S_OK;
+        if([Window isKeyWindow])
+            [Window makeFirstResponder: View];
+        return S_OK;
+    }
+    
     void EnterFullScreenMode ()
     {
         _fullScreenActive = true;
@@ -1858,7 +1877,6 @@ private:
         WindowEvents = events;
         [Window setLevel:NSPopUpMenuWindowLevel];
     }
-    
 protected:
     virtual NSWindowStyleMask GetStyle() override
     {
@@ -1876,6 +1894,11 @@ protected:
             return S_OK;
         }
     }
+public:
+    virtual bool ShouldTakeFocusOnShow() override
+    {
+        return false;
+    }
 };
 
 extern IAvnPopup* CreateAvnPopup(IAvnWindowEvents*events, IAvnGlContext* gl)
diff --git a/samples/interop/NativeEmbedSample/MainWindow.xaml b/samples/interop/NativeEmbedSample/MainWindow.xaml
index dcec9035e0..f2161a1bea 100644
--- a/samples/interop/NativeEmbedSample/MainWindow.xaml
+++ b/samples/interop/NativeEmbedSample/MainWindow.xaml
@@ -20,7 +20,16 @@
     <DockPanel DockPanel.Dock="Top">
       <Button DockPanel.Dock="Right" Click="ShowPopupDelay">Show popup (delay)</Button>
       <Button DockPanel.Dock="Right" Click="ShowPopup">Show popup</Button>
+      <Border DockPanel.Dock="Right" Background="#c0c0c0">
+        <ToolTip.Tip>
+          <ToolTip>
+              <TextBlock>Text</TextBlock>
+          </ToolTip>
+        </ToolTip.Tip>
+        <TextBlock>Tooltip</TextBlock>
+      </Border>
       <TextBox Text="Lorem ipsum dolor sit amet"/>
+      
     </DockPanel>
     <Grid ColumnDefinitions="*,5,*">
       <DockPanel>
diff --git a/src/Avalonia.Base/Collections/AvaloniaListExtensions.cs b/src/Avalonia.Base/Collections/AvaloniaListExtensions.cs
index d915887e4c..b52829a60f 100644
--- a/src/Avalonia.Base/Collections/AvaloniaListExtensions.cs
+++ b/src/Avalonia.Base/Collections/AvaloniaListExtensions.cs
@@ -140,6 +140,7 @@ namespace Avalonia.Collections
             }
         }
 
+        [Obsolete("Causes memory leaks. Use DynamicData or similar instead.")]
         public static IAvaloniaReadOnlyList<TDerived> CreateDerivedList<TSource, TDerived>(
             this IAvaloniaReadOnlyList<TSource> collection,
             Func<TSource, TDerived> select)
diff --git a/src/Avalonia.Controls/Utils/IEnumerableUtils.cs b/src/Avalonia.Controls/Utils/IEnumerableUtils.cs
index 9b6444fc66..9614d079d9 100644
--- a/src/Avalonia.Controls/Utils/IEnumerableUtils.cs
+++ b/src/Avalonia.Controls/Utils/IEnumerableUtils.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections;
+using System.Collections.Generic;
 using System.Linq;
 
 namespace Avalonia.Controls.Utils
@@ -15,12 +16,14 @@ namespace Avalonia.Controls.Utils
         {
             if (items != null)
             {
-                var collection = items as ICollection;
-
-                if (collection != null)
+                if (items is ICollection collection)
                 {
                     return collection.Count;
                 }
+                else if (items is IReadOnlyCollection<object> readOnly)
+                {
+                    return readOnly.Count;
+                }
                 else
                 {
                     return Enumerable.Count(items.Cast<object>());
diff --git a/src/Avalonia.Diagnostics/Diagnostics/DevTools.cs b/src/Avalonia.Diagnostics/Diagnostics/DevTools.cs
index b3a8f4745e..4899be2955 100644
--- a/src/Avalonia.Diagnostics/Diagnostics/DevTools.cs
+++ b/src/Avalonia.Diagnostics/Diagnostics/DevTools.cs
@@ -45,7 +45,15 @@ namespace Avalonia.Diagnostics
 
                 window.Closed += DevToolsClosed;
                 s_open.Add(root, window);
-                window.Show();
+
+                if (root is Window inspectedWindow)
+                {
+                    window.Show(inspectedWindow);
+                }
+                else
+                {
+                    window.Show();
+                }
             }
 
             return Disposable.Create(() => window?.Close());
diff --git a/src/Avalonia.Diagnostics/Diagnostics/ViewModels/LogicalTreeNode.cs b/src/Avalonia.Diagnostics/Diagnostics/ViewModels/LogicalTreeNode.cs
index a7c2997346..38788ef8ee 100644
--- a/src/Avalonia.Diagnostics/Diagnostics/ViewModels/LogicalTreeNode.cs
+++ b/src/Avalonia.Diagnostics/Diagnostics/ViewModels/LogicalTreeNode.cs
@@ -1,3 +1,4 @@
+using System;
 using Avalonia.Collections;
 using Avalonia.Controls;
 using Avalonia.LogicalTree;
@@ -9,7 +10,7 @@ namespace Avalonia.Diagnostics.ViewModels
         public LogicalTreeNode(ILogical logical, TreeNode parent)
             : base((Control)logical, parent)
         {
-            Children = logical.LogicalChildren.CreateDerivedList(x => new LogicalTreeNode(x, this));
+            Children = new LogicalTreeNodeCollection(this, logical);
         }
 
         public static LogicalTreeNode[] Create(object control)
@@ -17,5 +18,31 @@ namespace Avalonia.Diagnostics.ViewModels
             var logical = control as ILogical;
             return logical != null ? new[] { new LogicalTreeNode(logical, null) } : null;
         }
+
+        internal class LogicalTreeNodeCollection : TreeNodeCollection
+        {
+            private readonly ILogical _control;
+            private IDisposable _subscription;
+
+            public LogicalTreeNodeCollection(TreeNode owner, ILogical control)
+                : base(owner)
+            {
+                _control = control;
+            }
+
+            public override void Dispose()
+            {
+                base.Dispose();
+                _subscription?.Dispose();
+            }
+
+            protected override void Initialize(AvaloniaList<TreeNode> nodes)
+            {
+                _subscription = _control.LogicalChildren.ForEachItem(
+                    (i, item) => nodes.Insert(i, new LogicalTreeNode(item, Owner)),
+                    (i, item) => nodes.RemoveAt(i),
+                    () => nodes.Clear());
+            }
+        }
     }
 }
diff --git a/src/Avalonia.Diagnostics/Diagnostics/ViewModels/MainViewModel.cs b/src/Avalonia.Diagnostics/Diagnostics/ViewModels/MainViewModel.cs
index 1d19e1a346..acc3ef16c2 100644
--- a/src/Avalonia.Diagnostics/Diagnostics/ViewModels/MainViewModel.cs
+++ b/src/Avalonia.Diagnostics/Diagnostics/ViewModels/MainViewModel.cs
@@ -1,4 +1,5 @@
 using System;
+using System.ComponentModel;
 using Avalonia.Controls;
 using Avalonia.Diagnostics.Models;
 using Avalonia.Input;
@@ -12,6 +13,7 @@ namespace Avalonia.Diagnostics.ViewModels
         private readonly TreePageViewModel _logicalTree;
         private readonly TreePageViewModel _visualTree;
         private readonly EventsPageViewModel _events;
+        private readonly IDisposable _pointerOverSubscription;
         private ViewModelBase _content;
         private int _selectedTab;
         private string _focusedControl;
@@ -25,16 +27,9 @@ namespace Avalonia.Diagnostics.ViewModels
             _events = new EventsPageViewModel(root);
 
             UpdateFocusedControl();
-            KeyboardDevice.Instance.PropertyChanged += (s, e) =>
-            {
-                if (e.PropertyName == nameof(KeyboardDevice.Instance.FocusedElement))
-                {
-                    UpdateFocusedControl();
-                }
-            };
-
+            KeyboardDevice.Instance.PropertyChanged += KeyboardPropertyChanged;
             SelectedTab = 0;
-            root.GetObservable(TopLevel.PointerOverElementProperty)
+            _pointerOverSubscription = root.GetObservable(TopLevel.PointerOverElementProperty)
                 .Subscribe(x => PointerOverElement = x?.GetType().Name);
             Console = new ConsoleViewModel(UpdateConsoleContext);
         }
@@ -129,6 +124,8 @@ namespace Avalonia.Diagnostics.ViewModels
 
         public void Dispose()
         {
+            KeyboardDevice.Instance.PropertyChanged -= KeyboardPropertyChanged;
+            _pointerOverSubscription.Dispose();
             _logicalTree.Dispose();
             _visualTree.Dispose();
         }
@@ -137,5 +134,13 @@ namespace Avalonia.Diagnostics.ViewModels
         {
             FocusedControl = KeyboardDevice.Instance.FocusedElement?.GetType().Name;
         }
+
+        private void KeyboardPropertyChanged(object sender, PropertyChangedEventArgs e)
+        {
+            if (e.PropertyName == nameof(KeyboardDevice.Instance.FocusedElement))
+            {
+                UpdateFocusedControl();
+            }
+        }
     }
 }
diff --git a/src/Avalonia.Diagnostics/Diagnostics/ViewModels/TreeNode.cs b/src/Avalonia.Diagnostics/Diagnostics/ViewModels/TreeNode.cs
index aa27538abc..cb5f5b1fda 100644
--- a/src/Avalonia.Diagnostics/Diagnostics/ViewModels/TreeNode.cs
+++ b/src/Avalonia.Diagnostics/Diagnostics/ViewModels/TreeNode.cs
@@ -3,15 +3,15 @@ using System.Collections.Generic;
 using System.Collections.Specialized;
 using System.Reactive;
 using System.Reactive.Linq;
-using Avalonia.Collections;
 using Avalonia.Controls;
 using Avalonia.LogicalTree;
 using Avalonia.VisualTree;
 
 namespace Avalonia.Diagnostics.ViewModels
 {
-    internal class TreeNode : ViewModelBase
+    internal class TreeNode : ViewModelBase, IDisposable
     {
+        private IDisposable _classesSubscription;
         private string _classes;
         private bool _isExpanded;
 
@@ -33,7 +33,7 @@ namespace Avalonia.Diagnostics.ViewModels
                         x => control.Classes.CollectionChanged -= x)
                     .TakeUntil(removed);
 
-                classesChanged.Select(_ => Unit.Default)
+                _classesSubscription = classesChanged.Select(_ => Unit.Default)
                     .StartWith(Unit.Default)
                     .Subscribe(_ =>
                     {
@@ -49,7 +49,7 @@ namespace Avalonia.Diagnostics.ViewModels
             }
         }
 
-        public IAvaloniaReadOnlyList<TreeNode> Children
+        public TreeNodeCollection Children
         {
             get;
             protected set;
@@ -104,6 +104,12 @@ namespace Avalonia.Diagnostics.ViewModels
             }
         }
 
+        public void Dispose()
+        {
+            _classesSubscription.Dispose();
+            Children.Dispose();
+        }
+
         private static int IndexOf(IReadOnlyList<TreeNode> collection, TreeNode item)
         {
             var count = collection.Count;
diff --git a/src/Avalonia.Diagnostics/Diagnostics/ViewModels/TreeNodeCollection.cs b/src/Avalonia.Diagnostics/Diagnostics/ViewModels/TreeNodeCollection.cs
new file mode 100644
index 0000000000..8b4f03bd23
--- /dev/null
+++ b/src/Avalonia.Diagnostics/Diagnostics/ViewModels/TreeNodeCollection.cs
@@ -0,0 +1,78 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Collections.Specialized;
+using System.ComponentModel;
+using Avalonia.Collections;
+
+namespace Avalonia.Diagnostics.ViewModels
+{
+    internal abstract class TreeNodeCollection : IAvaloniaReadOnlyList<TreeNode>, IDisposable
+    {
+        private AvaloniaList<TreeNode> _inner;
+
+        public TreeNodeCollection(TreeNode owner) => Owner = owner;
+
+        public TreeNode this[int index]
+        {
+            get
+            {
+                EnsureInitialized();
+                return _inner[index];
+            }
+        }
+
+        public int Count
+        {
+            get
+            {
+                EnsureInitialized();
+                return _inner.Count;
+            }
+        }
+
+        protected TreeNode Owner { get; }
+
+        public event NotifyCollectionChangedEventHandler CollectionChanged
+        {
+            add => _inner.CollectionChanged += value;
+            remove => _inner.CollectionChanged -= value;
+        }
+
+        public event PropertyChangedEventHandler PropertyChanged
+        {
+            add => _inner.PropertyChanged += value;
+            remove => _inner.PropertyChanged -= value;
+        }
+
+        public virtual void Dispose()
+        {
+            if (_inner is object)
+            {
+                foreach (var node in _inner)
+                {
+                    node.Dispose();
+                }
+            }
+        }
+
+        public IEnumerator<TreeNode> GetEnumerator()
+        {
+            EnsureInitialized();
+            return _inner.GetEnumerator();
+        }
+
+        IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
+
+        protected abstract void Initialize(AvaloniaList<TreeNode> nodes);
+
+        private void EnsureInitialized()
+        {
+            if (_inner is null)
+            {
+                _inner = new AvaloniaList<TreeNode>();
+                Initialize(_inner);
+            }
+        }
+    }
+}
diff --git a/src/Avalonia.Diagnostics/Diagnostics/ViewModels/TreePageViewModel.cs b/src/Avalonia.Diagnostics/Diagnostics/ViewModels/TreePageViewModel.cs
index 38ac88a83c..ec48cff399 100644
--- a/src/Avalonia.Diagnostics/Diagnostics/ViewModels/TreePageViewModel.cs
+++ b/src/Avalonia.Diagnostics/Diagnostics/ViewModels/TreePageViewModel.cs
@@ -62,7 +62,15 @@ namespace Avalonia.Diagnostics.ViewModels
             }
         }
 
-        public void Dispose() => _details?.Dispose();
+        public void Dispose()
+        {
+            foreach (var node in Nodes)
+            {
+                node.Dispose();
+            }
+
+            _details?.Dispose();
+        }
 
         public TreeNode FindNode(IControl control)
         {
diff --git a/src/Avalonia.Diagnostics/Diagnostics/ViewModels/VisualTreeNode.cs b/src/Avalonia.Diagnostics/Diagnostics/ViewModels/VisualTreeNode.cs
index 5383cb2b68..bc40edf477 100644
--- a/src/Avalonia.Diagnostics/Diagnostics/ViewModels/VisualTreeNode.cs
+++ b/src/Avalonia.Diagnostics/Diagnostics/ViewModels/VisualTreeNode.cs
@@ -1,3 +1,4 @@
+using System;
 using Avalonia.Collections;
 using Avalonia.Styling;
 using Avalonia.VisualTree;
@@ -9,16 +10,7 @@ namespace Avalonia.Diagnostics.ViewModels
         public VisualTreeNode(IVisual visual, TreeNode parent)
             : base(visual, parent)
         {
-            var host = visual as IVisualTreeHost;
-
-            if (host?.Root == null)
-            {
-                Children = visual.VisualChildren.CreateDerivedList(x => new VisualTreeNode(x, this));
-            }
-            else
-            {
-                Children = new AvaloniaList<VisualTreeNode>(new[] { new VisualTreeNode(host.Root, this) });
-            }
+            Children = new VisualTreeNodeCollection(this, visual);
 
             if ((Visual is IStyleable styleable))
             {
@@ -33,5 +25,30 @@ namespace Avalonia.Diagnostics.ViewModels
             var visual = control as IVisual;
             return visual != null ? new[] { new VisualTreeNode(visual, null) } : null;
         }
+
+        internal class VisualTreeNodeCollection : TreeNodeCollection
+        {
+            private readonly IVisual _control;
+            private IDisposable _subscription;
+
+            public VisualTreeNodeCollection(TreeNode owner, IVisual control)
+                : base(owner)
+            {
+                _control = control;
+            }
+
+            public override void Dispose()
+            {
+                _subscription?.Dispose();
+            }
+
+            protected override void Initialize(AvaloniaList<TreeNode> nodes)
+            {
+                _subscription = _control.VisualChildren.ForEachItem(
+                    (i, item) => nodes.Insert(i, new VisualTreeNode(item, Owner)),
+                    (i, item) => nodes.RemoveAt(i),
+                    () => nodes.Clear());
+            }
+        }
     }
 }
diff --git a/src/Avalonia.Diagnostics/Diagnostics/Views/MainWindow.xaml.cs b/src/Avalonia.Diagnostics/Diagnostics/Views/MainWindow.xaml.cs
index 3abdb5034a..10861538ae 100644
--- a/src/Avalonia.Diagnostics/Diagnostics/Views/MainWindow.xaml.cs
+++ b/src/Avalonia.Diagnostics/Diagnostics/Views/MainWindow.xaml.cs
@@ -14,8 +14,8 @@ namespace Avalonia.Diagnostics.Views
 {
     internal class MainWindow : Window, IStyleHost
     {
+        private readonly IDisposable _keySubscription;
         private TopLevel _root;
-        private IDisposable _keySubscription;
 
         public MainWindow()
         {
@@ -33,8 +33,22 @@ namespace Avalonia.Diagnostics.Views
             {
                 if (_root != value)
                 {
+                    if (_root != null)
+                    {
+                        _root.Closed -= RootClosed;
+                    }
+
                     _root = value;
-                    DataContext = new MainViewModel(value);
+
+                    if (_root != null)
+                    {
+                        _root.Closed += RootClosed;
+                        DataContext = new MainViewModel(value);
+                    }
+                    else
+                    {
+                        DataContext = null;
+                    }
                 }
             }
         }
@@ -45,6 +59,8 @@ namespace Avalonia.Diagnostics.Views
         {
             base.OnClosed(e);
             _keySubscription.Dispose();
+            _root.Closed -= RootClosed;
+            _root = null;
             ((MainViewModel)DataContext)?.Dispose();
         }
 
@@ -70,5 +86,7 @@ namespace Avalonia.Diagnostics.Views
                 }
             }
         }
+
+        private void RootClosed(object sender, EventArgs e) => Close();
     }
 }
diff --git a/src/Avalonia.Native/PopupImpl.cs b/src/Avalonia.Native/PopupImpl.cs
index c41be1723b..b0da5fdc43 100644
--- a/src/Avalonia.Native/PopupImpl.cs
+++ b/src/Avalonia.Native/PopupImpl.cs
@@ -10,6 +10,7 @@ namespace Avalonia.Native
         private readonly IAvaloniaNativeFactory _factory;
         private readonly AvaloniaNativePlatformOptions _opts;
         private readonly GlPlatformFeature _glFeature;
+        private readonly IWindowBaseImpl _parent;
 
         public PopupImpl(IAvaloniaNativeFactory factory,
             AvaloniaNativePlatformOptions opts,
@@ -19,6 +20,7 @@ namespace Avalonia.Native
             _factory = factory;
             _opts = opts;
             _glFeature = glFeature;
+            _parent = parent;
             using (var e = new PopupEvents(this))
             {
                 var context = _opts.UseGpu ? glFeature?.DeferredContext : null;
@@ -58,6 +60,16 @@ namespace Avalonia.Native
             }
         }
 
+        public override void Show()
+        {
+            var parent = _parent;
+            while (parent is PopupImpl p) 
+                parent = p._parent;
+            if (parent is WindowImpl w)
+                w.Native.TakeFocusFromChildren();
+            base.Show();
+        }
+
         public override IPopupImpl CreatePopup() => new PopupImpl(_factory, _opts, _glFeature, this);
 
         public void SetWindowManagerAddShadowHint(bool enabled)
diff --git a/src/Avalonia.Native/WindowImplBase.cs b/src/Avalonia.Native/WindowImplBase.cs
index 930b5800ba..9a90f65d1b 100644
--- a/src/Avalonia.Native/WindowImplBase.cs
+++ b/src/Avalonia.Native/WindowImplBase.cs
@@ -319,7 +319,7 @@ namespace Avalonia.Native
         }
 
 
-        public void Show()
+        public virtual void Show()
         {
             _native.Show();
         }
diff --git a/src/Avalonia.Themes.Fluent/ToolTip.xaml b/src/Avalonia.Themes.Fluent/ToolTip.xaml
index cf6f32f9bc..47ad494bbf 100644
--- a/src/Avalonia.Themes.Fluent/ToolTip.xaml
+++ b/src/Avalonia.Themes.Fluent/ToolTip.xaml
@@ -1,11 +1,14 @@
-<Styles xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+<Styles xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"       
+        xmlns:sys="clr-namespace:System;assembly=netstandard">
+
   <Design.PreviewWith>
     <Grid RowDefinitions="Auto,Auto"
           ColumnDefinitions="Auto,Auto"
           HorizontalAlignment="Center">
       <Border Grid.Column="0"
               Grid.Row="1"
-              Background="{DynamicResource ThemeAccentBrush}"
+              Background="{DynamicResource SystemControlBackgroundAccentBrush}"
               Margin="5"
               Padding="50"
               ToolTip.Tip="Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.">
@@ -19,7 +22,7 @@
       <Border Name="Border"
               Grid.Column="1"
               Grid.Row="1"
-              Background="{DynamicResource ThemeAccentBrush}"
+              Background="{DynamicResource SystemControlBackgroundAccentBrush}"
               Margin="5"
               Padding="50"
               ToolTip.Placement="Bottom">
@@ -34,6 +37,10 @@
     </Grid>
   </Design.PreviewWith>
 
+  <Styles.Resources>
+    <sys:Double x:Key="ToolTipContentMaxWidth">320</sys:Double>
+  </Styles.Resources>
+
   <Style Selector="ToolTip">
     <Setter Property="Foreground" Value="{DynamicResource ToolTipForeground}" />
     <Setter Property="Background" Value="{DynamicResource ToolTipBackground}" />
@@ -42,6 +49,7 @@
     <Setter Property="FontFamily" Value="{DynamicResource ContentControlThemeFontFamily}" />
     <Setter Property="FontSize" Value="{DynamicResource ToolTipContentThemeFontSize}" />
     <Setter Property="Padding" Value="{DynamicResource ToolTipBorderThemePadding}" />
+    <Setter Property="MaxWidth" Value="{DynamicResource ToolTipContentMaxWidth}" />
     <Setter Property="Transitions">
       <Transitions>
         <DoubleTransition Property="Opacity" Duration="0:0:0.15" />
@@ -56,7 +64,7 @@
                 Padding="{TemplateBinding Padding}"
                 CornerRadius="{DynamicResource OverlayCornerRadius}">
           <ContentPresenter Name="PART_ContentPresenter"
-                            MaxWidth="320"
+                            MaxWidth="{TemplateBinding MaxWidth}"
                             Content="{TemplateBinding Content}"
                             ContentTemplate="{TemplateBinding ContentTemplate}" />
         </Border>