Merge branch 'master' into SkiaOpacityMaskFixes

build/MicroCom.targets

@@ -15,7 +15,8 @@
           Inputs="@(AvnComIdl);$(MSBuildThisFileDirectory)../src/tools/MicroComGenerator/**/*.cs"
           Outputs="%(AvnComIdl.OutputFile)">
     <Message Importance="high" Text="Generating file %(AvnComIdl.OutputFile) from @(AvnComIdl)" />
-    <Exec Command="dotnet $(MSBuildThisFileDirectory)../src/tools/MicroComGenerator/bin/$(Configuration)/netcoreapp3.1/MicroComGenerator.dll -i @(AvnComIdl) --cs %(AvnComIdl.OutputFile)" LogStandardErrorAsError="true" />
+    <Exec Command="dotnet &quot;$(MSBuildThisFileDirectory)../src/tools/MicroComGenerator/bin/$(Configuration)/netcoreapp3.1/MicroComGenerator.dll&quot; -i @(AvnComIdl) --cs %(AvnComIdl.OutputFile)" 
+          LogStandardErrorAsError="true" />
     <ItemGroup>
       <!-- Remove and re-add generated file, this is needed for the clean build -->
       <Compile Remove="%(AvnComIdl.OutputFile)"/>

native/Avalonia.Native/src/OSX/KeyTransform.mm

@@ -222,6 +222,7 @@ std::map<int, const char*> s_QwertyKeyMap =
     { 45, "n" },
     { 46, "m" },
     { 47, "." },
+    { 48, "\t" },
     { 49, " " },
     { 50, "`" },
     { 51, "" },

native/Avalonia.Native/src/OSX/window.mm

@@ -713,6 +713,12 @@ private:
             if(cparent == nullptr)
                 return E_INVALIDARG;
             
+            // If one tries to show a child window with a minimized parent window, then the parent window will be
+            // restored but MacOS isn't kind enough to *tell* us that, so the window will be left in a non-interactive
+            // state. Detect this and explicitly restore the parent window ourselves to avoid this situation.
+            if (cparent->WindowState() == Minimized)
+                cparent->SetWindowState(Normal);
+            
             [cparent->Window addChildWindow:Window ordered:NSWindowAbove];
             
             UpdateStyle();
@@ -1204,6 +1210,7 @@ private:
                 }
                 
                 _actualWindowState = _lastWindowState;
+                WindowEvents->WindowStateChanged(_actualWindowState);
             }
             
             

samples/ControlCatalog/Pages/DataGridPage.xaml

@@ -28,7 +28,7 @@
                     DockPanel.Dock="Top"/>
           <DataGrid Name="dataGrid1" Margin="12" CanUserResizeColumns="True" CanUserReorderColumns="True" CanUserSortColumns="True" HeadersVisibility="All">
             <DataGrid.Columns>
-              <DataGridTextColumn Header="Country" Binding="{Binding Name}" Width="6*" />
+              <DataGridTextColumn Header="Country" Binding="{Binding Name}" Width="6*" MinWidth="400"  />
               <!-- CompiledBinding example of usage. -->
               <DataGridTextColumn Header="Region" Binding="{CompiledBinding Region}" Width="4*" x:DataType="local:Country" />
               <DataGridTextColumn Header="Population" Binding="{Binding Population}" Width="3*" />

samples/ControlCatalog/SideBar.xaml

@@ -16,7 +16,6 @@
         <Setter Property="Template">
             <ControlTemplate>
                 <Border 
-                    Margin="{TemplateBinding Margin}"
                     BorderBrush="{TemplateBinding BorderBrush}"
                     BorderThickness="{TemplateBinding BorderThickness}">
                     <DockPanel>

samples/RenderDemo/SideBar.xaml

@@ -7,7 +7,6 @@
     <Setter Property="Template">
       <ControlTemplate>
         <Border
-            Margin="{TemplateBinding Margin}"
             BorderBrush="{TemplateBinding BorderBrush}"
             BorderThickness="{TemplateBinding BorderThickness}">
           <DockPanel>

src/Avalonia.Controls.DataGrid/DataGrid.cs

@@ -25,6 +25,7 @@ using System.ComponentModel.DataAnnotations;
 using Avalonia.Controls.Utils;
 using Avalonia.Layout;
 using Avalonia.Controls.Metadata;
+using Avalonia.Input.GestureRecognizers;
 
 namespace Avalonia.Controls
 {
@@ -2214,35 +2215,71 @@ namespace Avalonia.Controls
         /// <param name="e">PointerWheelEventArgs</param>
         protected override void OnPointerWheelChanged(PointerWheelEventArgs e)
         {
-            if (IsEnabled && !e.Handled && DisplayData.NumDisplayedScrollingElements > 0)
+            e.Handled = e.Handled || UpdateScroll(e.Delta * DATAGRID_mouseWheelDelta);
+        }
+
+        internal bool UpdateScroll(Vector delta)
+        {
+            if (IsEnabled && DisplayData.NumDisplayedScrollingElements > 0)
             {
-                double scrollHeight = 0;
+                var handled = false;
-                var delta = DATAGRID_mouseWheelDelta * e.Delta.Y;
+                var scrollHeight = 0d;
-                var deltaAbs = Math.Abs(delta);
 
-                if (delta > 0)
+                // Vertical scroll handling
+                if (delta.Y > 0)
                 {
-                    scrollHeight = Math.Max(-_verticalOffset, -deltaAbs);
+                    scrollHeight = Math.Max(-_verticalOffset, -delta.Y);
                 }
-                else if (delta < 0)
+                else if (delta.Y < 0)
                 {
                     if (_vScrollBar != null && VerticalScrollBarVisibility == ScrollBarVisibility.Visible)
                     {
-                        scrollHeight = Math.Min(Math.Max(0, _vScrollBar.Maximum - _verticalOffset), deltaAbs);
+                        scrollHeight = Math.Min(Math.Max(0, _vScrollBar.Maximum - _verticalOffset), -delta.Y);
                     }
                     else
                     {
                         double maximum = EdgedRowsHeightCalculated - CellsHeight;
-                        scrollHeight = Math.Min(Math.Max(0, maximum - _verticalOffset), deltaAbs);
+                        scrollHeight = Math.Min(Math.Max(0, maximum - _verticalOffset), -delta.Y);
                     }
                 }
+
                 if (scrollHeight != 0)
                 {
                     DisplayData.PendingVerticalScrollHeight = scrollHeight;
+                    handled = true;
+                }
+
+                // Horizontal scroll handling
+                if (delta.X != 0)
+                {
+                    var originalHorizontalOffset = HorizontalOffset;
+                    var horizontalOffset = originalHorizontalOffset - delta.X;
+                    var widthNotVisible = Math.Max(0, ColumnsInternal.VisibleEdgedColumnsWidth - CellsWidth);
+
+                    if (horizontalOffset < 0)
+                    {
+                        horizontalOffset = 0;
+                    }
+                    if (horizontalOffset > widthNotVisible)
+                    {
+                        horizontalOffset = widthNotVisible;
+                    }
+
+                    if (horizontalOffset != originalHorizontalOffset)
+                    {
+                        HorizontalOffset = horizontalOffset;
+                        handled = true;
+                    }
+                }
+
+                if (handled)
+                {
                     InvalidateRowsMeasure(invalidateIndividualElements: false);
-                    e.Handled = true;
+                    return true;
                 }
             }
+
+            return false;
         }
 
         /// <summary>

src/Avalonia.Controls.DataGrid/DataGridCell.cs

@@ -173,7 +173,15 @@ namespace Avalonia.Controls
                     }
                     if (OwningRow != null)
                     {
-                        e.Handled = OwningGrid.UpdateStateOnMouseLeftButtonDown(e, ColumnIndex, OwningRow.Slot, !e.Handled);
+                        var handled = OwningGrid.UpdateStateOnMouseLeftButtonDown(e, ColumnIndex, OwningRow.Slot, !e.Handled);
+
+                        // Do not handle PointerPressed with touch,
+                        // so we can start scroll gesture on the same event.
+                        if (e.Pointer.Type != PointerType.Touch)
+                        {
+                            e.Handled = handled;
+                        }
+
                         OwningGrid.UpdatedStateOnMouseLeftButtonDown = true;
                     }
                 }

src/Avalonia.Controls.DataGrid/Primitives/DataGridRowsPresenter.cs

@@ -5,6 +5,9 @@
 
 using System;
 using System.Diagnostics;
+
+using Avalonia.Input;
+using Avalonia.Input.GestureRecognizers;
 using Avalonia.Layout;
 using Avalonia.Media;
 
@@ -16,6 +19,11 @@ namespace Avalonia.Controls.Primitives
     /// </summary>
     public sealed class DataGridRowsPresenter : Panel
     {
+        public DataGridRowsPresenter()
+        {
+            AddHandler(Gestures.ScrollGestureEvent, OnScrollGesture);
+        }
+
         internal DataGrid OwningGrid
         {
             get;
@@ -176,6 +184,11 @@ namespace Avalonia.Controls.Primitives
             return new Size(totalCellsWidth + headerWidth, totalHeight);
         }
 
+        private void OnScrollGesture(object sender, ScrollGestureEventArgs e)
+        {
+            e.Handled = e.Handled || OwningGrid.UpdateScroll(-e.Delta);
+        }
+
 #if DEBUG
         internal void PrintChildren()
         {

src/Avalonia.Controls.DataGrid/Themes/Default.xaml

@@ -247,7 +247,11 @@
             <DataGridColumnHeader Name="PART_TopRightCornerHeader" Grid.Column="2"/>
             <Rectangle Name="PART_ColumnHeadersAndRowsSeparator" Grid.ColumnSpan="3" VerticalAlignment="Bottom" StrokeThickness="1" Height="1" Fill="{DynamicResource ThemeControlMidHighBrush}"/>
 
-            <DataGridRowsPresenter Name="PART_RowsPresenter" Grid.ColumnSpan="2" Grid.Row="1" />
+            <DataGridRowsPresenter Name="PART_RowsPresenter" Grid.ColumnSpan="2" Grid.Row="1">
+              <DataGridRowsPresenter.GestureRecognizers>
+                <ScrollGestureRecognizer CanHorizontallyScroll="True" CanVerticallyScroll="True" />
+              </DataGridRowsPresenter.GestureRecognizers>
+            </DataGridRowsPresenter>
             <Rectangle Name="PART_BottomRightCorner" Fill="{DynamicResource ThemeControlMidHighBrush}" Grid.Column="2" Grid.Row="2" />
             <Rectangle Name="BottomLeftCorner" Fill="{DynamicResource ThemeControlMidHighBrush}" Grid.Row="2" Grid.ColumnSpan="2" />
             <ScrollBar Name="PART_VerticalScrollbar" Orientation="Vertical" Grid.Column="2" Grid.Row="1" Width="{DynamicResource ScrollBarThickness}"/>

src/Avalonia.Controls.DataGrid/Themes/Fluent.xaml

@@ -601,7 +601,11 @@
             <DataGridRowsPresenter Name="PART_RowsPresenter"
                                    Grid.Row="1"
                                    Grid.RowSpan="2"
-                                   Grid.ColumnSpan="3" />
+                                   Grid.ColumnSpan="3">
+              <DataGridRowsPresenter.GestureRecognizers>
+                <ScrollGestureRecognizer CanHorizontallyScroll="True" CanVerticallyScroll="True" />
+              </DataGridRowsPresenter.GestureRecognizers>
+            </DataGridRowsPresenter>
             <Rectangle Name="PART_BottomRightCorner"
                        Fill="{DynamicResource DataGridScrollBarsSeparatorBackground}"
                        Grid.Column="2"

src/Avalonia.Controls/ContextMenu.cs

@@ -2,7 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Linq;
-
+using Avalonia.Controls.Diagnostics;
 using Avalonia.Controls.Generators;
 using Avalonia.Controls.Platform;
 using Avalonia.Controls.Primitives;
@@ -21,7 +21,7 @@ namespace Avalonia.Controls
     /// <summary>
     /// A control context menu.
     /// </summary>
-    public class ContextMenu : MenuBase, ISetterValue
+    public class ContextMenu : MenuBase, ISetterValue, IPopupHostProvider
     {
         /// <summary>
         /// Defines the <see cref="HorizontalOffset"/> property.
@@ -82,6 +82,7 @@ namespace Avalonia.Controls
         private Popup? _popup;
         private List<Control>? _attachedControls;
         private IInputElement? _previousFocus;
+        private Action<IPopupHost?>? _popupHostChangedHandler;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="ContextMenu"/> class.
@@ -304,6 +305,14 @@ namespace Avalonia.Controls
             }
         }
 
+        IPopupHost? IPopupHostProvider.PopupHost => _popup?.Host;
+
+        event Action<IPopupHost?>? IPopupHostProvider.PopupHostChanged 
+        { 
+            add => _popupHostChangedHandler += value; 
+            remove => _popupHostChangedHandler -= value;
+        }
+
         protected override IItemContainerGenerator CreateItemContainerGenerator()
         {
             return new MenuItemContainerGenerator(this);
@@ -364,6 +373,8 @@ namespace Avalonia.Controls
         {
             _previousFocus = FocusManager.Instance?.Current;
             Focus();
+
+            _popupHostChangedHandler?.Invoke(_popup!.Host);
         }
 
         private void PopupClosing(object sender, CancelEventArgs e)
@@ -397,6 +408,8 @@ namespace Avalonia.Controls
                 RoutedEvent = MenuClosedEvent,
                 Source = this,
             });
+            
+            _popupHostChangedHandler?.Invoke(null);
         }
 
         private void PopupKeyUp(object sender, KeyEventArgs e)

src/Avalonia.Controls/Diagnostics/IPopupHostProvider.cs

@@ -0,0 +1,23 @@
+using System;
+using Avalonia.Controls.Primitives;
+
+#nullable enable
+
+namespace Avalonia.Controls.Diagnostics
+{
+    /// <summary>
+    /// Diagnostics interface to retrieve an associated <see cref="IPopupHost"/>.
+    /// </summary>
+    public interface IPopupHostProvider
+    {
+        /// <summary>
+        /// The popup host.
+        /// </summary>
+        IPopupHost? PopupHost { get; }
+
+        /// <summary>
+        /// Raised when the popup host changes.
+        /// </summary>
+        event Action<IPopupHost?>? PopupHostChanged;
+    }
+}

src/Avalonia.Controls/Diagnostics/ToolTipDiagnostics.cs

@@ -0,0 +1,15 @@
+#nullable enable
+
+namespace Avalonia.Controls.Diagnostics
+{
+    /// <summary>
+    /// Helper class to provide diagnostics information for <see cref="ToolTip"/>.
+    /// </summary>
+    public static class ToolTipDiagnostics
+    {
+        /// <summary>
+        /// Provides access to the internal <see cref="ToolTip.ToolTipProperty"/> for use in DevTools.
+        /// </summary>
+        public static AvaloniaProperty<ToolTip?> ToolTipProperty = ToolTip.ToolTipProperty;
+    }
+}

src/Avalonia.Controls/Flyouts/FlyoutBase.cs

@@ -1,19 +1,18 @@
 using System;
 using System.ComponentModel;
+using Avalonia.Controls.Diagnostics;
 using System.Linq;
-
 using Avalonia.Input;
 using Avalonia.Input.Platform;
 using Avalonia.Input.Raw;
 using Avalonia.Layout;
 using Avalonia.Logging;
-using Avalonia.Rendering;
 
 #nullable enable
 
 namespace Avalonia.Controls.Primitives
 {
-    public abstract class FlyoutBase : AvaloniaObject
+    public abstract class FlyoutBase : AvaloniaObject, IPopupHostProvider
     {
         static FlyoutBase()
         {
@@ -59,6 +58,7 @@ namespace Avalonia.Controls.Primitives
         private Rect? _enlargedPopupRect;
         private PixelRect? _enlargePopupRectScreenPixelRect;
         private IDisposable? _transientDisposable;
+        private Action<IPopupHost?>? _popupHostChangedHandler;
 
         public FlyoutBase()
         {
@@ -103,6 +103,14 @@ namespace Avalonia.Controls.Primitives
             private set => SetAndRaise(TargetProperty, ref _target, value);
         }
 
+        IPopupHost? IPopupHostProvider.PopupHost => Popup?.Host;
+
+        event Action<IPopupHost?>? IPopupHostProvider.PopupHostChanged 
+        { 
+            add => _popupHostChangedHandler += value; 
+            remove => _popupHostChangedHandler -= value;
+        }
+
         public event EventHandler? Closed;
         public event EventHandler<CancelEventArgs>? Closing;
         public event EventHandler? Opened;
@@ -363,6 +371,8 @@ namespace Avalonia.Controls.Primitives
         private void OnPopupOpened(object sender, EventArgs e)
         {
             IsOpen = true;
+
+            _popupHostChangedHandler?.Invoke(Popup!.Host);
         }
 
         private void OnPopupClosing(object sender, CancelEventArgs e)
@@ -376,6 +386,8 @@ namespace Avalonia.Controls.Primitives
         private void OnPopupClosed(object sender, EventArgs e)
         {
             HideCore(false);
+
+            _popupHostChangedHandler?.Invoke(null);
         }
 
         // This method is handling both popup logical tree and target logical tree.

src/Avalonia.Controls/Flyouts/FlyoutPresenter.cs

@@ -6,15 +6,6 @@ namespace Avalonia.Controls
 {
     public class FlyoutPresenter : ContentControl
     {
-        public static readonly StyledProperty<CornerRadius> CornerRadiusProperty =
-            Border.CornerRadiusProperty.AddOwner<FlyoutPresenter>();
-
-        public CornerRadius CornerRadius
-        {
-            get => GetValue(CornerRadiusProperty);
-            set => SetValue(CornerRadiusProperty, value);
-        }
-
         protected override void OnKeyDown(KeyEventArgs e)
         {
             if (e.Key == Key.Escape)

src/Avalonia.Controls/Primitives/OverlayPopupHost.cs

@@ -140,10 +140,5 @@ namespace Avalonia.Controls.Primitives
 
             return new OverlayPopupHost(overlayLayer);
         }
-
-        public override void Render(DrawingContext context)
-        {
-            context.FillRectangle(Brushes.White, new Rect(default, Bounds.Size));
-        }
     }
 }

src/Avalonia.Controls/Primitives/Popup.cs

@@ -2,6 +2,7 @@ using System;
 using System.ComponentModel;
 using System.Linq;
 using System.Reactive.Disposables;
+using Avalonia.Controls.Diagnostics;
 using Avalonia.Controls.Presenters;
 using Avalonia.Controls.Primitives.PopupPositioning;
 using Avalonia.Input;
@@ -18,7 +19,7 @@ namespace Avalonia.Controls.Primitives
     /// <summary>
     /// Displays a popup window.
     /// </summary>
-    public class Popup : Control, IVisualTreeHost
+    public class Popup : Control, IVisualTreeHost, IPopupHostProvider
     {
         public static readonly StyledProperty<bool> WindowManagerAddShadowHintProperty =
             AvaloniaProperty.Register<PopupRoot, bool>(nameof(WindowManagerAddShadowHint), true);
@@ -134,6 +135,7 @@ namespace Avalonia.Controls.Primitives
         private bool _ignoreIsOpenChanged;
         private PopupOpenState? _openState;
         private IInputElement _overlayInputPassThroughElement;
+        private Action<IPopupHost?>? _popupHostChangedHandler;
 
         /// <summary>
         /// Initializes static members of the <see cref="Popup"/> class.
@@ -351,6 +353,14 @@ namespace Avalonia.Controls.Primitives
         /// </summary>
         IVisual? IVisualTreeHost.Root => _openState?.PopupHost.HostedVisualTreeRoot;
 
+        IPopupHost? IPopupHostProvider.PopupHost => Host;
+
+        event Action<IPopupHost?>? IPopupHostProvider.PopupHostChanged 
+        { 
+            add => _popupHostChangedHandler += value; 
+            remove => _popupHostChangedHandler -= value;
+        }
+
         /// <summary>
         /// Opens the popup.
         /// </summary>
@@ -482,6 +492,8 @@ namespace Avalonia.Controls.Primitives
             }
 
             Opened?.Invoke(this, EventArgs.Empty);
+
+            _popupHostChangedHandler?.Invoke(Host);
         }
 
         /// <summary>
@@ -591,6 +603,8 @@ namespace Avalonia.Controls.Primitives
             _openState.Dispose();
             _openState = null;
 
+            _popupHostChangedHandler?.Invoke(null);
+
             using (BeginIgnoringIsOpen())
             {
                 IsOpen = false;

src/Avalonia.Controls/Primitives/ScrollBar.cs

@@ -57,6 +57,18 @@ namespace Avalonia.Controls.Primitives
         public static readonly StyledProperty<bool> AllowAutoHideProperty =
             AvaloniaProperty.Register<ScrollBar, bool>(nameof(AllowAutoHide), true);
 
+        /// <summary>
+        /// Defines the <see cref="HideDelay"/> property.
+        /// </summary>
+        public static readonly StyledProperty<TimeSpan> HideDelayProperty =
+            AvaloniaProperty.Register<ScrollBar, TimeSpan>(nameof(HideDelay), TimeSpan.FromSeconds(2));
+
+        /// <summary>
+        /// Defines the <see cref="ShowDelay"/> property.
+        /// </summary>
+        public static readonly StyledProperty<TimeSpan> ShowDelayProperty =
+            AvaloniaProperty.Register<ScrollBar, TimeSpan>(nameof(ShowDelay), TimeSpan.FromSeconds(0.5));
+
         private Button _lineUpButton;
         private Button _lineDownButton;
         private Button _pageUpButton;
@@ -126,6 +138,24 @@ namespace Avalonia.Controls.Primitives
             get => GetValue(AllowAutoHideProperty);
             set => SetValue(AllowAutoHideProperty, value);
         }
+        
+        /// <summary>
+        /// Gets a value that determines how long will be the hide delay after user stops interacting with the scrollbar.
+        /// </summary>
+        public TimeSpan HideDelay
+        {
+            get => GetValue(HideDelayProperty);
+            set => SetValue(HideDelayProperty, value);
+        }
+        
+        /// <summary>
+        /// Gets a value that determines how long will be the show delay when user starts interacting with the scrollbar.
+        /// </summary>
+        public TimeSpan ShowDelay
+        {
+            get => GetValue(ShowDelayProperty);
+            set => SetValue(ShowDelayProperty, value);
+        }
 
         public event EventHandler<ScrollEventArgs> Scroll;
 
@@ -296,12 +326,12 @@ namespace Avalonia.Controls.Primitives
 
         private void CollapseAfterDelay()
         {
-            InvokeAfterDelay(Collapse, TimeSpan.FromSeconds(2));
+            InvokeAfterDelay(Collapse, HideDelay);
         }
 
         private void ExpandAfterDelay()
         {
-            InvokeAfterDelay(Expand, TimeSpan.FromMilliseconds(400));
+            InvokeAfterDelay(Expand, ShowDelay);
         }
 
         private void Collapse()

src/Avalonia.Controls/Primitives/TemplatedControl.cs

@@ -5,7 +5,8 @@ using Avalonia.Logging;
 using Avalonia.LogicalTree;
 using Avalonia.Media;
 using Avalonia.Styling;
-using Avalonia.VisualTree;
+
+#nullable enable
 
 namespace Avalonia.Controls.Primitives
 {
@@ -17,13 +18,13 @@ namespace Avalonia.Controls.Primitives
         /// <summary>
         /// Defines the <see cref="Background"/> property.
         /// </summary>
-        public static readonly StyledProperty<IBrush> BackgroundProperty =
+        public static readonly StyledProperty<IBrush?> BackgroundProperty =
             Border.BackgroundProperty.AddOwner<TemplatedControl>();
 
         /// <summary>
         /// Defines the <see cref="BorderBrush"/> property.
         /// </summary>
-        public static readonly StyledProperty<IBrush> BorderBrushProperty =
+        public static readonly StyledProperty<IBrush?> BorderBrushProperty =
             Border.BorderBrushProperty.AddOwner<TemplatedControl>();
 
         /// <summary>
@@ -32,6 +33,12 @@ namespace Avalonia.Controls.Primitives
         public static readonly StyledProperty<Thickness> BorderThicknessProperty =
             Border.BorderThicknessProperty.AddOwner<TemplatedControl>();
 
+        /// <summary>
+        /// Defines the <see cref="CornerRadius"/> property.
+        /// </summary>
+        public static readonly StyledProperty<CornerRadius> CornerRadiusProperty =
+            Border.CornerRadiusProperty.AddOwner<TemplatedControl>();
+
         /// <summary>
         /// Defines the <see cref="FontFamily"/> property.
         /// </summary>
@@ -59,7 +66,7 @@ namespace Avalonia.Controls.Primitives
         /// <summary>
         /// Defines the <see cref="Foreground"/> property.
         /// </summary>
-        public static readonly StyledProperty<IBrush> ForegroundProperty =
+        public static readonly StyledProperty<IBrush?> ForegroundProperty =
             TextBlock.ForegroundProperty.AddOwner<TemplatedControl>();
 
         /// <summary>
@@ -71,8 +78,8 @@ namespace Avalonia.Controls.Primitives
         /// <summary>
         /// Defines the <see cref="Template"/> property.
         /// </summary>
-        public static readonly StyledProperty<IControlTemplate> TemplateProperty =
+        public static readonly StyledProperty<IControlTemplate?> TemplateProperty =
-            AvaloniaProperty.Register<TemplatedControl, IControlTemplate>(nameof(Template));
+            AvaloniaProperty.Register<TemplatedControl, IControlTemplate?>(nameof(Template));
 
         /// <summary>
         /// Defines the IsTemplateFocusTarget attached property.
@@ -88,7 +95,7 @@ namespace Avalonia.Controls.Primitives
                 "TemplateApplied", 
                 RoutingStrategies.Direct);
 
-        private IControlTemplate _appliedTemplate;
+        private IControlTemplate? _appliedTemplate;
 
         /// <summary>
         /// Initializes static members of the <see cref="TemplatedControl"/> class.
@@ -111,7 +118,7 @@ namespace Avalonia.Controls.Primitives
         /// <summary>
         /// Gets or sets the brush used to draw the control's background.
         /// </summary>
-        public IBrush Background
+        public IBrush? Background
         {
             get { return GetValue(BackgroundProperty); }
             set { SetValue(BackgroundProperty, value); }
@@ -120,7 +127,7 @@ namespace Avalonia.Controls.Primitives
         /// <summary>
         /// Gets or sets the brush used to draw the control's border.
         /// </summary>
-        public IBrush BorderBrush
+        public IBrush? BorderBrush
         {
             get { return GetValue(BorderBrushProperty); }
             set { SetValue(BorderBrushProperty, value); }
@@ -135,6 +142,15 @@ namespace Avalonia.Controls.Primitives
             set { SetValue(BorderThicknessProperty, value); }
         }
 
+        /// <summary>
+        /// Gets or sets the radius of the border rounded corners.
+        /// </summary>
+        public CornerRadius CornerRadius
+        {
+            get { return GetValue(CornerRadiusProperty); }
+            set { SetValue(CornerRadiusProperty, value); }
+        }
+
         /// <summary>
         /// Gets or sets the font family used to draw the control's text.
         /// </summary>
@@ -174,7 +190,7 @@ namespace Avalonia.Controls.Primitives
         /// <summary>
         /// Gets or sets the brush used to draw the control's text and other foreground elements.
         /// </summary>
-        public IBrush Foreground
+        public IBrush? Foreground
         {
             get { return GetValue(ForegroundProperty); }
             set { SetValue(ForegroundProperty, value); }
@@ -192,7 +208,7 @@ namespace Avalonia.Controls.Primitives
         /// <summary>
         /// Gets or sets the template that defines the control's appearance.
         /// </summary>
-        public IControlTemplate Template
+        public IControlTemplate? Template
         {
             get { return GetValue(TemplateProperty); }
             set { SetValue(TemplateProperty, value); }
@@ -265,7 +281,9 @@ namespace Avalonia.Controls.Primitives
 
                     var e = new TemplateAppliedEventArgs(nameScope);
                     OnApplyTemplate(e);
+#pragma warning disable CS0618 // Type or member is obsolete
                     OnTemplateApplied(e);
+#pragma warning restore CS0618 // Type or member is obsolete
                     RaiseEvent(e);
                 }
 

src/Avalonia.Controls/TextBox.cs

@@ -31,7 +31,7 @@ namespace Avalonia.Controls
 
         public static KeyGesture PasteGesture { get; } = AvaloniaLocator.Current
             .GetService<PlatformHotkeyConfiguration>()?.Paste.FirstOrDefault();
-        
+
         public static readonly StyledProperty<bool> AcceptsReturnProperty =
             AvaloniaProperty.Register<TextBox, bool>(nameof(AcceptsReturn));
 
@@ -117,7 +117,7 @@ namespace Avalonia.Controls
 
         public static readonly StyledProperty<bool> RevealPasswordProperty =
             AvaloniaProperty.Register<TextBox, bool>(nameof(RevealPassword));
-        
+
         public static readonly DirectProperty<TextBox, bool> CanCutProperty =
             AvaloniaProperty.RegisterDirect<TextBox, bool>(
                 nameof(CanCut),
@@ -135,7 +135,7 @@ namespace Avalonia.Controls
 
         public static readonly StyledProperty<bool> IsUndoEnabledProperty =
             AvaloniaProperty.Register<TextBox, bool>(
-                nameof(IsUndoEnabled), 
+                nameof(IsUndoEnabled),
                 defaultValue: true);
 
         public static readonly DirectProperty<TextBox, int> UndoLimitProperty =
@@ -157,6 +157,10 @@ namespace Avalonia.Controls
             }
 
             public bool Equals(UndoRedoState other) => ReferenceEquals(Text, other.Text) || Equals(Text, other.Text);
+
+            public override bool Equals(object obj) => obj is UndoRedoState other && Equals(other);
+
+            public override int GetHashCode() => Text.GetHashCode();
         }
 
         private string _text;
@@ -174,6 +178,10 @@ namespace Avalonia.Controls
         private string _newLine = Environment.NewLine;
         private static readonly string[] invalidCharacters = new String[1] { "\u007f" };
 
+        private int _selectedTextChangesMadeSinceLastUndoSnapshot;
+        private bool _hasDoneSnapshotOnce;
+        private const int _maxCharsBeforeUndoSnapshot = 7;
+
         static TextBox()
         {
             FocusableProperty.OverrideDefaultValue(typeof(TextBox), true);
@@ -202,7 +210,8 @@ namespace Avalonia.Controls
                 horizontalScrollBarVisibility,
                 BindingPriority.Style);
             _undoRedoHelper = new UndoRedoHelper<UndoRedoState>(this);
-
+            _selectedTextChangesMadeSinceLastUndoSnapshot = 0;
+            _hasDoneSnapshotOnce = false;
             UpdatePseudoclasses();
         }
 
@@ -331,6 +340,7 @@ namespace Avalonia.Controls
                     if (SetAndRaise(TextProperty, ref _text, value) && IsUndoEnabled && !_isUndoingRedoing)
                     {
                         _undoRedoHelper.Clear();
+                        SnapshotUndoRedo(); // so we always have an initial state
                     }
                 }
             }
@@ -341,16 +351,16 @@ namespace Avalonia.Controls
             get { return GetSelection(); }
             set
             {
-                SnapshotUndoRedo();
                 if (string.IsNullOrEmpty(value))
                 {
+                    _selectedTextChangesMadeSinceLastUndoSnapshot++;
+                    SnapshotUndoRedo(ignoreChangeCount: false);
                     DeleteSelection();
                 }
                 else
                 {
                     HandleTextInput(value);
                 }
-                SnapshotUndoRedo();
             }
         }
 
@@ -422,7 +432,7 @@ namespace Avalonia.Controls
             get { return _newLine; }
             set { SetAndRaise(NewLineProperty, ref _newLine, value); }
         }
-        
+
         /// <summary>
         /// Clears the current selection, maintaining the <see cref="CaretIndex"/>
         /// </summary>
@@ -480,11 +490,13 @@ namespace Avalonia.Controls
                     var oldValue = _undoRedoHelper.Limit;
                     _undoRedoHelper.Limit = value;
                     RaisePropertyChanged(UndoLimitProperty, oldValue, value);
-                } 
+                }
                 // from docs at
                 // https://docs.microsoft.com/en-us/dotnet/api/system.windows.controls.primitives.textboxbase.isundoenabled:
                 // "Setting UndoLimit clears the undo queue."
                 _undoRedoHelper.Clear();
+                _selectedTextChangesMadeSinceLastUndoSnapshot = 0;
+                _hasDoneSnapshotOnce = false;
             }
         }
 
@@ -515,6 +527,8 @@ namespace Avalonia.Controls
                 // Therefore, if you disable undo and then re-enable it, undo commands still do not work
                 // because the undo stack was emptied when you disabled undo."
                 _undoRedoHelper.Clear();
+                _selectedTextChangesMadeSinceLastUndoSnapshot = 0;
+                _hasDoneSnapshotOnce = false;
             }
         }
 
@@ -577,23 +591,25 @@ namespace Avalonia.Controls
             {
                 return;
             }
-            
+
             input = RemoveInvalidCharacters(input);
-            
+
             if (string.IsNullOrEmpty(input))
             {
                 return;
             }
-            
+            _selectedTextChangesMadeSinceLastUndoSnapshot++;
+            SnapshotUndoRedo(ignoreChangeCount: false);
+
             string text = Text ?? string.Empty;
             int caretIndex = CaretIndex;
             int newLength = input.Length + text.Length - Math.Abs(SelectionStart - SelectionEnd);
-            
+
             if (MaxLength > 0 && newLength > MaxLength)
             {
                 input = input.Remove(Math.Max(0, input.Length - (newLength - MaxLength)));
             }
-            
+
             if (!string.IsNullOrEmpty(input))
             {
                 DeleteSelection();
@@ -627,7 +643,6 @@ namespace Avalonia.Controls
             SnapshotUndoRedo();
             Copy();
             DeleteSelection();
-            SnapshotUndoRedo();
         }
 
         public async void Copy()
@@ -647,7 +662,6 @@ namespace Avalonia.Controls
 
             SnapshotUndoRedo();
             HandleTextInput(text);
-            SnapshotUndoRedo();
         }
 
         protected override void OnKeyDown(KeyEventArgs e)
@@ -696,6 +710,7 @@ namespace Avalonia.Controls
             {
                 try
                 {
+                    SnapshotUndoRedo();
                     _isUndoingRedoing = true;
                     _undoRedoHelper.Undo();
                 }
@@ -830,7 +845,6 @@ namespace Avalonia.Controls
                             CaretIndex -= removedCharacters;
                             ClearSelection();
                         }
-                        SnapshotUndoRedo();
 
                         handled = true;
                         break;
@@ -858,7 +872,6 @@ namespace Avalonia.Controls
                             SetTextInternal(text.Substring(0, caretIndex) +
                                             text.Substring(caretIndex + removedCharacters));
                         }
-                        SnapshotUndoRedo();
 
                         handled = true;
                         break;
@@ -868,7 +881,6 @@ namespace Avalonia.Controls
                         {
                             SnapshotUndoRedo();
                             HandleTextInput(NewLine);
-                            SnapshotUndoRedo();
                             handled = true;
                         }
 
@@ -879,7 +891,6 @@ namespace Avalonia.Controls
                         {
                             SnapshotUndoRedo();
                             HandleTextInput("\t");
-                            SnapshotUndoRedo();
                             handled = true;
                         }
                         else
@@ -889,6 +900,10 @@ namespace Avalonia.Controls
 
                         break;
 
+                    case Key.Space:
+                        SnapshotUndoRedo(); // always snapshot in between words
+                        break;
+
                     default:
                         handled = false;
                         break;
@@ -1319,11 +1334,19 @@ namespace Avalonia.Controls
             }
         }
 
-        private void SnapshotUndoRedo()
+        private void SnapshotUndoRedo(bool ignoreChangeCount = true)
         {
             if (IsUndoEnabled)
             {
-                _undoRedoHelper.Snapshot();
+                if (ignoreChangeCount ||
+                    !_hasDoneSnapshotOnce ||
+                    (!ignoreChangeCount &&
+                        _selectedTextChangesMadeSinceLastUndoSnapshot >= _maxCharsBeforeUndoSnapshot))
+                {
+                    _undoRedoHelper.Snapshot();
+                    _selectedTextChangesMadeSinceLastUndoSnapshot = 0;
+                    _hasDoneSnapshotOnce = true;
+                }
             }
         }
     }

src/Avalonia.Controls/ToolTip.cs

@@ -1,9 +1,8 @@
 #nullable enable
 using System;
-using System.Reactive.Linq;
+using Avalonia.Controls.Diagnostics;
 using Avalonia.Controls.Metadata;
 using Avalonia.Controls.Primitives;
-using Avalonia.VisualTree;
 
 namespace Avalonia.Controls
 {
@@ -17,7 +16,7 @@ namespace Avalonia.Controls
     /// assigning the content that you want displayed.
     /// </remarks>
     [PseudoClasses(":open")]
-    public class ToolTip : ContentControl
+    public class ToolTip : ContentControl, IPopupHostProvider
     {
         /// <summary>
         /// Defines the ToolTip.Tip attached property.
@@ -61,7 +60,8 @@ namespace Avalonia.Controls
         internal static readonly AttachedProperty<ToolTip?> ToolTipProperty =
             AvaloniaProperty.RegisterAttached<ToolTip, Control, ToolTip?>("ToolTip");
 
-        private IPopupHost? _popup;
+        private IPopupHost? _popupHost;
+        private Action<IPopupHost?>? _popupHostChangedHandler;
 
         /// <summary>
         /// Initializes static members of the <see cref="ToolTip"/> class.
@@ -251,35 +251,45 @@ namespace Avalonia.Controls
 
             tooltip.RecalculatePosition(control);
         }
+        
+        IPopupHost? IPopupHostProvider.PopupHost => _popupHost;
+
+        event Action<IPopupHost?>? IPopupHostProvider.PopupHostChanged 
+        { 
+            add => _popupHostChangedHandler += value; 
+            remove => _popupHostChangedHandler -= value;
+        }
 
         internal void RecalculatePosition(Control control)
         {
-            _popup?.ConfigurePosition(control, GetPlacement(control), new Point(GetHorizontalOffset(control), GetVerticalOffset(control)));
+            _popupHost?.ConfigurePosition(control, GetPlacement(control), new Point(GetHorizontalOffset(control), GetVerticalOffset(control)));
         }
 
         private void Open(Control control)
         {
             Close();
 
-            _popup = OverlayPopupHost.CreatePopupHost(control, null);
+            _popupHost = OverlayPopupHost.CreatePopupHost(control, null);
-            _popup.SetChild(this);
+            _popupHost.SetChild(this);
-            ((ISetLogicalParent)_popup).SetParent(control);
+            ((ISetLogicalParent)_popupHost).SetParent(control);
             
-            _popup.ConfigurePosition(control, GetPlacement(control), 
+            _popupHost.ConfigurePosition(control, GetPlacement(control), 
                 new Point(GetHorizontalOffset(control), GetVerticalOffset(control)));
 
-            WindowManagerAddShadowHintChanged(_popup, false);
+            WindowManagerAddShadowHintChanged(_popupHost, false);
 
-            _popup.Show();
+            _popupHost.Show();
+            _popupHostChangedHandler?.Invoke(_popupHost);
         }
 
         private void Close()
         {
-            if (_popup != null)
+            if (_popupHost != null)
             {
-                _popup.SetChild(null);
+                _popupHost.SetChild(null);
-                _popup.Dispose();
+                _popupHost.Dispose();
-                _popup = null;
+                _popupHost = null;
+                _popupHostChangedHandler?.Invoke(null);
             }
         }
 

src/Avalonia.Controls/Utils/UndoRedoHelper.cs

@@ -7,7 +7,7 @@ using Avalonia.Utilities;
 
 namespace Avalonia.Controls.Utils
 {
-    class UndoRedoHelper<TState> : WeakTimer.IWeakTimerSubscriber where TState : struct, IEquatable<TState>
+    class UndoRedoHelper<TState>
     {
         private readonly IUndoRedoHost _host;
 
@@ -31,7 +31,6 @@ namespace Avalonia.Controls.Utils
         public UndoRedoHelper(IUndoRedoHost host)
         {
             _host = host;
-            WeakTimer.StartWeakTimer(this, TimeSpan.FromSeconds(1));
         }
 
         public void Undo()
@@ -61,7 +60,7 @@ namespace Avalonia.Controls.Utils
             if (_states.Last != null)
             {
                 _states.Last.Value = state;
-            } 
+            }
         }
 
         public void UpdateLastState()
@@ -103,11 +102,5 @@ namespace Avalonia.Controls.Utils
             _states.Clear();
             _currentNode = null;
         }
-
-        bool WeakTimer.IWeakTimerSubscriber.Tick()
-        {
-            Snapshot();
-            return true;
-        }
     }
 }

src/Avalonia.Diagnostics/Diagnostics/ViewModels/MainViewModel.cs

@@ -1,6 +1,5 @@
 using System;
 using System.ComponentModel;
-
 using Avalonia.Controls;
 using Avalonia.Diagnostics.Models;
 using Avalonia.Input;
@@ -22,6 +21,7 @@ namespace Avalonia.Diagnostics.ViewModels
         private bool _shouldVisualizeMarginPadding = true;
         private bool _shouldVisualizeDirtyRects;
         private bool _showFpsOverlay;
+        private bool _freezePopups;
 
 #nullable disable
         // Remove "nullable disable" after MemberNotNull will work on our CI.
@@ -41,6 +41,12 @@ namespace Avalonia.Diagnostics.ViewModels
             Console = new ConsoleViewModel(UpdateConsoleContext);
         }
 
+        public bool FreezePopups
+        {
+            get => _freezePopups;
+            set => RaiseAndSetIfChanged(ref _freezePopups, value);
+        }
+
         public bool ShouldVisualizeMarginPadding
         {
             get => _shouldVisualizeMarginPadding;

src/Avalonia.Diagnostics/Diagnostics/ViewModels/TreeNode.cs

@@ -1,26 +1,28 @@
 using System;
-using System.Collections.Generic;
 using System.Collections.Specialized;
 using System.Reactive;
 using System.Reactive.Linq;
 using Avalonia.Controls;
+using Avalonia.Controls.Primitives;
 using Avalonia.LogicalTree;
+using Avalonia.Media;
 using Avalonia.VisualTree;
 
 namespace Avalonia.Diagnostics.ViewModels
 {
     internal abstract class TreeNode : ViewModelBase, IDisposable
     {
-        private IDisposable? _classesSubscription;
+        private readonly IDisposable? _classesSubscription;
         private string _classes;
         private bool _isExpanded;
 
-        public TreeNode(IVisual visual, TreeNode? parent)
+        protected TreeNode(IVisual visual, TreeNode? parent, string? customName = null)
         {
+            _classes = string.Empty;
             Parent = parent;
-            Type = visual.GetType().Name;
+            Type = customName ?? visual.GetType().Name;
             Visual = visual;
-            _classes = string.Empty;
+            FontWeight = IsRoot ? FontWeight.Bold : FontWeight.Normal;
 
             if (visual is IControl control)
             {
@@ -52,6 +54,12 @@ namespace Avalonia.Diagnostics.ViewModels
             }
         }
 
+        private bool IsRoot => Visual is TopLevel ||
+                               Visual is ContextMenu ||
+                               Visual is IPopupHost;
+
+        public FontWeight FontWeight { get; }
+
         public abstract TreeNodeCollection Children
         {
             get;
@@ -95,20 +103,5 @@ namespace Avalonia.Diagnostics.ViewModels
             _classesSubscription?.Dispose();
             Children.Dispose();
         }
-
-        private static int IndexOf(IReadOnlyList<TreeNode> collection, TreeNode item)
-        {
-            var count = collection.Count;
-
-            for (var i = 0; i < count; ++i)
-            {
-                if (collection[i] == item)
-                {
-                    return i;
-                }
-            }
-
-            throw new AvaloniaInternalException("TreeNode was not present in parent Children collection.");
-        }
     }
 }

src/Avalonia.Diagnostics/Diagnostics/ViewModels/VisualTreeNode.cs

@@ -1,5 +1,10 @@
 using System;
+using System.Reactive.Disposables;
+using System.Reactive.Linq;
 using Avalonia.Collections;
+using Avalonia.Controls;
+using Avalonia.Controls.Diagnostics;
+using Avalonia.Controls.Primitives;
 using Avalonia.Styling;
 using Avalonia.VisualTree;
 
@@ -7,31 +12,30 @@ namespace Avalonia.Diagnostics.ViewModels
 {
     internal class VisualTreeNode : TreeNode
     {
-        public VisualTreeNode(IVisual visual, TreeNode? parent)
+        public VisualTreeNode(IVisual visual, TreeNode? parent, string? customName = null)
-            : base(visual, parent)
+            : base(visual, parent, customName)
         {
             Children = new VisualTreeNodeCollection(this, visual);
 
-            if ((Visual is IStyleable styleable))
+            if (Visual is IStyleable styleable)
-            {
                 IsInTemplate = styleable.TemplatedParent != null;
-            }
         }
 
-        public bool IsInTemplate { get; private set; }
+        public bool IsInTemplate { get; }
 
         public override TreeNodeCollection Children { get; }
 
         public static VisualTreeNode[] Create(object control)
         {
-            var visual = control as IVisual;
+            return control is IVisual visual ?
-            return visual != null ? new[] { new VisualTreeNode(visual, null) } : Array.Empty<VisualTreeNode>();
+                new[] { new VisualTreeNode(visual, null) } :
+                Array.Empty<VisualTreeNode>();
         }
 
         internal class VisualTreeNodeCollection : TreeNodeCollection
         {
             private readonly IVisual _control;
-            private IDisposable? _subscription;
+            private readonly CompositeDisposable _subscriptions = new CompositeDisposable(2);
 
             public VisualTreeNodeCollection(TreeNode owner, IVisual control)
                 : base(owner)
@@ -41,15 +45,106 @@ namespace Avalonia.Diagnostics.ViewModels
 
             public override void Dispose()
             {
-                _subscription?.Dispose();
+                _subscriptions.Dispose();
+            }
+
+            private static IObservable<PopupRoot?>? GetHostedPopupRootObservable(IVisual visual)
+            {
+                static IObservable<PopupRoot?> GetPopupHostObservable(
+                    IPopupHostProvider popupHostProvider,
+                    string? providerName = null)
+                {
+                    return Observable.FromEvent<IPopupHost?>(
+                            x => popupHostProvider.PopupHostChanged += x,
+                            x => popupHostProvider.PopupHostChanged -= x)
+                        .StartWith(popupHostProvider.PopupHost)
+                        .Select(popupHost =>
+                        {
+                            if (popupHost is IControl control)
+                                return new PopupRoot(
+                                    control,
+                                    providerName != null ? $"{providerName} ({control.GetType().Name})" : null);
+
+                            return (PopupRoot?)null;
+                        });
+                }
+
+                return visual switch
+                {
+                    Popup p => GetPopupHostObservable(p),
+                    Control c => Observable.CombineLatest(
+                            c.GetObservable(Control.ContextFlyoutProperty),
+                            c.GetObservable(Control.ContextMenuProperty),
+                            c.GetObservable(FlyoutBase.AttachedFlyoutProperty),
+                            c.GetObservable(ToolTipDiagnostics.ToolTipProperty),
+                            (ContextFlyout, ContextMenu, AttachedFlyout, ToolTip) =>
+                            {
+                                if (ContextMenu != null)
+                                    //Note: ContextMenus are special since all the items are added as visual children.
+                                    //So we don't need to go via Popup
+                                    return Observable.Return<PopupRoot?>(new PopupRoot(ContextMenu));
+
+                                if (ContextFlyout != null)
+                                    return GetPopupHostObservable(ContextFlyout, "ContextFlyout");
+
+                                if (AttachedFlyout != null)
+                                    return GetPopupHostObservable(AttachedFlyout, "AttachedFlyout");
+
+                                if (ToolTip != null)
+                                    return GetPopupHostObservable(ToolTip, "ToolTip");
+
+                                return Observable.Return<PopupRoot?>(null);
+                            })
+                        .Switch(),
+                    _ => null
+                };
             }
 
             protected override void Initialize(AvaloniaList<TreeNode> nodes)
             {
-                _subscription = _control.VisualChildren.ForEachItem(
+                _subscriptions.Clear();
-                    (i, item) => nodes.Insert(i, new VisualTreeNode(item, Owner)),
+
-                    (i, item) => nodes.RemoveAt(i),
+                if (GetHostedPopupRootObservable(_control) is { } popupRootObservable)
-                    () => nodes.Clear());
+                {
+                    VisualTreeNode? childNode = null;
+
+                    _subscriptions.Add(
+                        popupRootObservable
+                            .Subscribe(popupRoot =>
+                            {
+                                if (popupRoot != null)
+                                {
+                                    childNode = new VisualTreeNode(
+                                        popupRoot.Value.Root,
+                                        Owner,
+                                        popupRoot.Value.CustomName);
+
+                                    nodes.Add(childNode);
+                                }
+                                else if (childNode != null)
+                                {
+                                    nodes.Remove(childNode);
+                                }
+                            }));
+                }
+
+                _subscriptions.Add(
+                    _control.VisualChildren.ForEachItem(
+                        (i, item) => nodes.Insert(i, new VisualTreeNode(item, Owner)),
+                        (i, item) => nodes.RemoveAt(i),
+                        () => nodes.Clear()));
+            }
+
+            private struct PopupRoot
+            {
+                public PopupRoot(IControl root, string? customName = null)
+                {
+                    Root = root;
+                    CustomName = customName;
+                }
+
+                public IControl Root { get; }
+                public string? CustomName { get; }
             }
         }
     }

src/Avalonia.Diagnostics/Diagnostics/Views/MainView.xaml

@@ -5,14 +5,14 @@
   <Grid Name="rootGrid" RowDefinitions="Auto,Auto,*,Auto,0,Auto">
     <Menu>
       <MenuItem Header="_File">
-        <MenuItem Header="E_xit" Command="{Binding $parent[Window].Close}"/>
+        <MenuItem Header="E_xit" Command="{Binding $parent[Window].Close}" />
       </MenuItem>
       <MenuItem Header="_View">
         <MenuItem Header="_Console" Command="{Binding $parent[UserControl].ToggleConsole}">
           <MenuItem.Icon>
             <CheckBox BorderThickness="0"
                       IsChecked="{Binding Console.IsVisible}"
-                      IsEnabled="False"/>
+                      IsEnabled="False" />
           </MenuItem.Icon>
         </MenuItem>
       </MenuItem>
@@ -21,58 +21,68 @@
           <MenuItem.Icon>
             <CheckBox BorderThickness="0"
                       IsChecked="{Binding ShouldVisualizeMarginPadding}"
-                      IsEnabled="False"/>
+                      IsEnabled="False" />
           </MenuItem.Icon>
         </MenuItem>
         <MenuItem Header="Visualize dirty rects" Command="{Binding ToggleVisualizeDirtyRects}">
           <MenuItem.Icon>
             <CheckBox BorderThickness="0"
                       IsChecked="{Binding ShouldVisualizeDirtyRects}"
-                      IsEnabled="False"/>
+                      IsEnabled="False" />
           </MenuItem.Icon>
         </MenuItem>
-         <MenuItem Header="Show fps overlay" Command="{Binding ToggleFpsOverlay}">
+        <MenuItem Header="Show fps overlay" Command="{Binding ToggleFpsOverlay}">
           <MenuItem.Icon>
             <CheckBox BorderThickness="0"
                       IsChecked="{Binding ShowFpsOverlay}"
-                      IsEnabled="False"/>
+                      IsEnabled="False" />
           </MenuItem.Icon>
         </MenuItem>
       </MenuItem>
     </Menu>
-    
+
     <TabStrip Grid.Row="1" SelectedIndex="{Binding SelectedTab, Mode=TwoWay}">
-      <TabStripItem Content="Logical Tree"/>
+      <TabStripItem Content="Logical Tree" />
-      <TabStripItem Content="Visual Tree"/>
+      <TabStripItem Content="Visual Tree" />
-      <TabStripItem Content="Events"/>
+      <TabStripItem Content="Events" />
     </TabStrip>
 
     <ContentControl Grid.Row="2"
                     BorderBrush="{DynamicResource ThemeControlMidBrush}"
                     BorderThickness="0,1,0,0"
-                    Content="{Binding Content}"/>
+                    Content="{Binding Content}" />
 
     <GridSplitter Name="consoleSplitter" Grid.Row="3" Height="1"
                   Background="{DynamicResource ThemeControlMidBrush}"
-                  IsVisible="False"/>
+                  IsVisible="False" />
-    
+
     <views:ConsoleView Name="console"
                        Grid.Row="4"
                        DataContext="{Binding Console}"
-                       IsVisible="{Binding IsVisible}"/>
+                       IsVisible="{Binding IsVisible}" />
+
 
     <Border Grid.Row="5"
             BorderBrush="{DynamicResource ThemeControlMidBrush}"
             BorderThickness="0,1,0,0">
-      <StackPanel Spacing="4" Orientation="Horizontal">
+      <Grid ColumnDefinitions="*, Auto">
-        <TextBlock>Hold Ctrl+Shift over a control to inspect.</TextBlock>
+        <StackPanel Grid.Column="0" Spacing="4" Orientation="Horizontal">
-        <Separator Width="8"/>
+          <TextBlock>Hold Ctrl+Shift over a control to inspect.</TextBlock>
-        <TextBlock>Focused:</TextBlock>
+          <Separator Width="8" />
-        <TextBlock Text="{Binding FocusedControl}"/>
+          <TextBlock>Focused:</TextBlock>
-        <Separator Width="8"/>
+          <TextBlock Text="{Binding FocusedControl}" />
-        <TextBlock>Pointer Over:</TextBlock>
+          <Separator Width="8" />
-        <TextBlock Text="{Binding PointerOverElement}"/>
+          <TextBlock>Pointer Over:</TextBlock>
-      </StackPanel>
+          <TextBlock Text="{Binding PointerOverElement}" />
+        </StackPanel>
+
+        <TextBlock Grid.Column="1"
+                   Foreground="Gray"
+                   Margin="2 0"
+                   Text="Popups frozen"
+                   IsVisible="{Binding FreezePopups}" />
+      </Grid>
+
     </Border>
   </Grid>
 </UserControl>

src/Avalonia.Diagnostics/Diagnostics/Views/MainWindow.xaml.cs

@@ -1,8 +1,11 @@
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Reactive.Linq;
 using Avalonia.Controls;
+using Avalonia.Controls.Diagnostics;
 using Avalonia.Controls.Primitives;
+using Avalonia.Data;
 using Avalonia.Diagnostics.ViewModels;
 using Avalonia.Input;
 using Avalonia.Input.Raw;
@@ -15,6 +18,7 @@ namespace Avalonia.Diagnostics.Views
     internal class MainWindow : Window, IStyleHost
     {
         private readonly IDisposable _keySubscription;
+        private readonly Dictionary<Popup, IDisposable> _frozenPopupStates;
         private TopLevel? _root;
 
         public MainWindow()
@@ -23,23 +27,26 @@ namespace Avalonia.Diagnostics.Views
 
             _keySubscription = InputManager.Instance.Process
                 .OfType<RawKeyEventArgs>()
+                .Where(x => x.Type == RawKeyEventType.KeyDown)
                 .Subscribe(RawKeyDown);
 
+            _frozenPopupStates = new Dictionary<Popup, IDisposable>();
+
             EventHandler? lh = default;
             lh = (s, e) =>
-              {
+            {
-                  this.Opened -= lh;
+                this.Opened -= lh;
-                  if ((DataContext as MainViewModel)?.StartupScreenIndex is int index)
+                if ((DataContext as MainViewModel)?.StartupScreenIndex is { } index)
-                  {
+                {
-                      var screens = this.Screens;
+                    var screens = this.Screens;
-                      if (index > -1 && index < screens.ScreenCount)                          
+                    if (index > -1 && index < screens.ScreenCount)
-                      {
+                    {
-                          var screen = screens.All[index];
+                        var screen = screens.All[index];
-                          this.Position = screen.Bounds.TopLeft;
+                        this.Position = screen.Bounds.TopLeft;
-                          this.WindowState = WindowState.Maximized;
+                        this.WindowState = WindowState.Maximized;
-                      }
+                    }
-                  }
+                }
-              };
+            };
             this.Opened += lh;
         }
 
@@ -77,6 +84,13 @@ namespace Avalonia.Diagnostics.Views
             base.OnClosed(e);
             _keySubscription.Dispose();
 
+            foreach (var state in _frozenPopupStates)
+            {
+                state.Value.Dispose();
+            }
+
+            _frozenPopupStates.Clear();
+
             if (_root != null)
             {
                 _root.Closed -= RootClosed;
@@ -91,6 +105,53 @@ namespace Avalonia.Diagnostics.Views
             AvaloniaXamlLoader.Load(this);
         }
 
+        private IControl? GetHoveredControl(TopLevel topLevel)
+        {
+#pragma warning disable CS0618 // Type or member is obsolete
+            var point = (topLevel as IInputRoot)?.MouseDevice?.GetPosition(topLevel) ?? default;
+#pragma warning restore CS0618 // Type or member is obsolete                
+
+            return (IControl?)topLevel.GetVisualsAt(point, x =>
+                {
+                    if (x is AdornerLayer || !x.IsVisible)
+                    {
+                        return false;
+                    }
+
+                    return !(x is IInputElement ie) || ie.IsHitTestVisible;
+                })
+                .FirstOrDefault();
+        }
+
+        private static List<PopupRoot> GetPopupRoots(IVisual root)
+        {
+            var popupRoots = new List<PopupRoot>();
+
+            void ProcessProperty<T>(IControl control, AvaloniaProperty<T> property)
+            {
+                if (control.GetValue(property) is IPopupHostProvider popupProvider
+                    && popupProvider.PopupHost is PopupRoot popupRoot)
+                {
+                    popupRoots.Add(popupRoot);
+                }
+            }
+
+            foreach (var control in root.GetVisualDescendants().OfType<IControl>())
+            {
+                if (control is Popup p && p.Host is PopupRoot popupRoot)
+                {
+                    popupRoots.Add(popupRoot);
+                }
+
+                ProcessProperty(control, ContextFlyoutProperty);
+                ProcessProperty(control, ContextMenuProperty);
+                ProcessProperty(control, FlyoutBase.AttachedFlyoutProperty);
+                ProcessProperty(control, ToolTipDiagnostics.ToolTipProperty);
+            }
+
+            return popupRoots;
+        }
+
         private void RawKeyDown(RawKeyEventArgs e)
         {
             var vm = (MainViewModel?)DataContext;
@@ -99,34 +160,72 @@ namespace Avalonia.Diagnostics.Views
                 return;
             }
 
-            const RawInputModifiers modifiers = RawInputModifiers.Control | RawInputModifiers.Shift;
+            switch (e.Modifiers)
-
-            if (e.Modifiers == modifiers)
             {
-#pragma warning disable CS0618 // Type or member is obsolete
+                case RawInputModifiers.Control | RawInputModifiers.Shift:
-                var point = (Root as IInputRoot)?.MouseDevice?.GetPosition(Root) ?? default;
+                {
-#pragma warning restore CS0618 // Type or member is obsolete                
+                    IControl? control = null;
+
+                    foreach (var popupRoot in GetPopupRoots(Root))
+                    {
+                        control = GetHoveredControl(popupRoot);
+
+                        if (control != null)
+                        {
+                            break;
+                        }
+                    }
+
+                    control ??= GetHoveredControl(Root);
 
-                var control = Root.GetVisualsAt(point, x =>
+                    if (control != null)
                     {
-                        if (x is AdornerLayer || !x.IsVisible) return false;
+                        vm.SelectControl(control);
-                        if (!(x is IInputElement ie)) return true;
+                    }
-                        return ie.IsHitTestVisible;
+
-                    })
+                    break;
-                    .FirstOrDefault();
+                }
 
-                if (control != null)
+                case RawInputModifiers.Control | RawInputModifiers.Alt when e.Key == Key.F:
                 {
-                    vm.SelectControl((IControl)control);
+                    vm.FreezePopups = !vm.FreezePopups;
+
+                    foreach (var popupRoot in GetPopupRoots(Root))
+                    {
+                        if (popupRoot.Parent is Popup popup)
+                        {
+                            if (vm.FreezePopups)
+                            {
+                                var lightDismissEnabledState = popup.SetValue(
+                                    Popup.IsLightDismissEnabledProperty,
+                                    !vm.FreezePopups,
+                                    BindingPriority.Animation);
+
+                                if (lightDismissEnabledState != null)
+                                {
+                                    _frozenPopupStates[popup] = lightDismissEnabledState;
+                                }
+                            }
+                            else
+                            {
+                                //TODO Use Dictionary.Remove(Key, out Value) in netstandard 2.1
+                                if (_frozenPopupStates.ContainsKey(popup))
+                                {
+                                    _frozenPopupStates[popup].Dispose();
+                                    _frozenPopupStates.Remove(popup);
+                                }
+                            }
+                        }
+                    }
+
+                    break;
                 }
-            } 
+
-            else if (e.Modifiers == RawInputModifiers.Alt)
+                case RawInputModifiers.Alt when e.Key == Key.S || e.Key == Key.D:
-            {
-                if (e.Key == Key.S || e.Key == Key.D)
                 {
-                    var enable = e.Key == Key.S;
+                    vm.EnableSnapshotStyles(e.Key == Key.S);
 
-                    vm.EnableSnapshotStyles(enable);
+                    break;
                 }
             }
         }

src/Avalonia.Diagnostics/Diagnostics/Views/TreePageView.xaml

@@ -11,7 +11,7 @@
         <TreeDataTemplate DataType="vm:TreeNode"
                           ItemsSource="{Binding Children}">
           <StackPanel Orientation="Horizontal" Spacing="8">
-            <TextBlock Text="{Binding Type}"/>
+            <TextBlock Text="{Binding Type}" FontWeight="{Binding FontWeight}"/>
             <TextBlock Text="{Binding Classes}"/>
             <TextBlock Foreground="Gray" Text="{Binding ElementName}"/>
           </StackPanel>

src/Avalonia.Native/AvaloniaNativePlatform.cs

@@ -109,11 +109,17 @@ namespace Avalonia.Native
                 .Bind<IRenderLoop>().ToConstant(new RenderLoop())
                 .Bind<IRenderTimer>().ToConstant(new DefaultRenderTimer(60))
                 .Bind<ISystemDialogImpl>().ToConstant(new SystemDialogs(_factory.CreateSystemDialogs()))
-                .Bind<PlatformHotkeyConfiguration>().ToConstant(new PlatformHotkeyConfiguration(KeyModifiers.Meta))
+                .Bind<PlatformHotkeyConfiguration>().ToConstant(new PlatformHotkeyConfiguration(KeyModifiers.Meta, wholeWordTextActionModifiers: KeyModifiers.Alt))
                 .Bind<IMountedVolumeInfoProvider>().ToConstant(new MacOSMountedVolumeInfoProvider())
                 .Bind<IPlatformDragSource>().ToConstant(new AvaloniaNativeDragSource(_factory))
                 .Bind<IPlatformLifetimeEventsImpl>().ToConstant(applicationPlatform);
 
+            var hotkeys = AvaloniaLocator.Current.GetService<PlatformHotkeyConfiguration>();
+            hotkeys.MoveCursorToTheStartOfLine.Add(new KeyGesture(Key.Left, hotkeys.CommandModifiers));
+            hotkeys.MoveCursorToTheStartOfLineWithSelection.Add(new KeyGesture(Key.Left, hotkeys.CommandModifiers | hotkeys.SelectionModifiers));
+            hotkeys.MoveCursorToTheEndOfLine.Add(new KeyGesture(Key.Right, hotkeys.CommandModifiers));
+            hotkeys.MoveCursorToTheEndOfLineWithSelection.Add(new KeyGesture(Key.Right, hotkeys.CommandModifiers | hotkeys.SelectionModifiers));
+            
             if (_options.UseGpu)
             {
                 try

src/Avalonia.Themes.Default/AutoCompleteBox.xaml

@@ -11,6 +11,7 @@
                    Background="{TemplateBinding Background}" 
                    BorderBrush="{TemplateBinding BorderBrush}" 
                    BorderThickness="{TemplateBinding BorderThickness}"
+                   CornerRadius="{TemplateBinding CornerRadius}"
                    Padding="{TemplateBinding Padding}"
                    Watermark="{TemplateBinding Watermark}"
                    DataValidationErrors.Errors="{TemplateBinding (DataValidationErrors.Errors)}" />

src/Avalonia.Themes.Default/Button.xaml

@@ -13,6 +13,7 @@
                           Background="{TemplateBinding Background}"
                           BorderBrush="{TemplateBinding BorderBrush}"
                           BorderThickness="{TemplateBinding BorderThickness}"
+                          CornerRadius="{TemplateBinding CornerRadius}"
                           ContentTemplate="{TemplateBinding ContentTemplate}"
                           Content="{TemplateBinding Content}"
                           Padding="{TemplateBinding Padding}"
@@ -31,4 +32,4 @@
   <Style Selector="Button:disabled">
     <Setter Property="Opacity" Value="{DynamicResource ThemeDisabledOpacity}"/>
   </Style>
-</Styles>
+</Styles>

src/Avalonia.Themes.Default/ButtonSpinner.xaml

@@ -47,6 +47,7 @@
                 Background="{TemplateBinding Background}"
                 BorderBrush="{TemplateBinding BorderBrush}"
                 BorderThickness="{TemplateBinding BorderThickness}"
+                CornerRadius="{TemplateBinding CornerRadius}"
                 Margin="{TemplateBinding Padding}"
                 HorizontalAlignment="{TemplateBinding HorizontalAlignment}"
                 VerticalAlignment="{TemplateBinding VerticalAlignment}">
@@ -73,6 +74,7 @@
                 Background="{TemplateBinding Background}"
                 BorderBrush="{TemplateBinding BorderBrush}"
                 BorderThickness="{TemplateBinding BorderThickness}"
+                CornerRadius="{TemplateBinding CornerRadius}"
                 Margin="{TemplateBinding Padding}"
                 HorizontalAlignment="{TemplateBinding HorizontalAlignment}"
                 VerticalAlignment="{TemplateBinding VerticalAlignment}">

src/Avalonia.Themes.Default/Calendar.xaml

@@ -22,10 +22,11 @@
                         Background="{TemplateBinding Background}"
                         BorderBrush="{TemplateBinding BorderBrush}"
                         BorderThickness="{TemplateBinding BorderThickness}"
+                        CornerRadius="{TemplateBinding CornerRadius}"
                         HeaderBackground="{TemplateBinding HeaderBackground}"/>
 
         </StackPanel>
       </ControlTemplate>
     </Setter>
   </Style>
-</Styles>
+</Styles>

src/Avalonia.Themes.Default/CalendarDatePicker.xaml

@@ -88,7 +88,8 @@
           <TextBox Name="PART_TextBox"
                    Background="{TemplateBinding Background}" 
                    BorderBrush="{TemplateBinding BorderBrush}" 
-                   BorderThickness="{TemplateBinding BorderThickness}" 
+                   BorderThickness="{TemplateBinding BorderThickness}"
+                   CornerRadius="{TemplateBinding CornerRadius}"
                    Padding="{TemplateBinding Padding}"
                    Watermark="{TemplateBinding Watermark}"
                    UseFloatingWatermark="{TemplateBinding UseFloatingWatermark}"

src/Avalonia.Themes.Default/CalendarItem.xaml

@@ -8,14 +8,15 @@
 <Styles xmlns="https://github.com/avaloniaui"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
   <Style Selector="CalendarItem">
+    <Setter Property="CornerRadius" Value="1" />
     <Setter Property="Template">
       <ControlTemplate>
         <Panel>
           <Border BorderThickness="{TemplateBinding BorderThickness}"
+                  CornerRadius="{TemplateBinding CornerRadius}"
                   BorderBrush="{TemplateBinding BorderBrush}"
                   Background="{TemplateBinding Background}"
-                  Margin="0,2,0,2"
+                  Margin="0,2,0,2">
-                  CornerRadius="1">
 
             <Border CornerRadius="1"
                     BorderBrush="{DynamicResource ThemeBackgroundBrush}"

src/Avalonia.Themes.Default/Carousel.xaml

@@ -3,7 +3,8 @@
     <ControlTemplate>
       <Border Background="{TemplateBinding Background}"
               BorderBrush="{TemplateBinding BorderBrush}"
-              BorderThickness="{TemplateBinding BorderThickness}">
+              BorderThickness="{TemplateBinding BorderThickness}"
+              CornerRadius="{TemplateBinding CornerRadius}">
         <CarouselPresenter IsVirtualized="{TemplateBinding IsVirtualized}"
                            Items="{TemplateBinding Items}"
                            ItemsPanel="{TemplateBinding ItemsPanel}"

src/Avalonia.Themes.Default/CheckBox.xaml

@@ -14,6 +14,7 @@
                   Background="{TemplateBinding Background}"
                   BorderBrush="{TemplateBinding BorderBrush}"
                   BorderThickness="{TemplateBinding BorderThickness}"
+                  CornerRadius="{TemplateBinding CornerRadius}"
                   Width="18"
                   Height="18"
                   VerticalAlignment="Center">

src/Avalonia.Themes.Default/ComboBox.xaml

@@ -32,7 +32,8 @@
         <Border Name="border"
                 Background="{TemplateBinding Background}"
                 BorderBrush="{TemplateBinding BorderBrush}"
-                BorderThickness="{TemplateBinding BorderThickness}">
+                BorderThickness="{TemplateBinding BorderThickness}"
+                CornerRadius="{TemplateBinding CornerRadius}">
           <Grid ColumnDefinitions="*,Auto">
             <TextBlock Name="PlaceholderTextBlock"
                        Grid.Column="0"

src/Avalonia.Themes.Default/ComboBoxItem.xaml

@@ -10,6 +10,7 @@
                           Background="{TemplateBinding Background}"
                           BorderBrush="{TemplateBinding BorderBrush}"
                           BorderThickness="{TemplateBinding BorderThickness}"
+                          CornerRadius="{TemplateBinding CornerRadius}"
                           ContentTemplate="{TemplateBinding ContentTemplate}"
                           Content="{TemplateBinding Content}"
                           HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"

src/Avalonia.Themes.Default/ContentControl.xaml

@@ -5,6 +5,7 @@
                         Background="{TemplateBinding Background}"
                         BorderBrush="{TemplateBinding BorderBrush}"
                         BorderThickness="{TemplateBinding BorderThickness}"
+                        CornerRadius="{TemplateBinding CornerRadius}"
                         ContentTemplate="{TemplateBinding ContentTemplate}"
                         Content="{TemplateBinding Content}"
                         Padding="{TemplateBinding Padding}"
@@ -12,4 +13,4 @@
                         HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"/>
     </ControlTemplate>
   </Setter>
-</Style>
+</Style>

src/Avalonia.Themes.Default/ContextMenu.xaml

@@ -9,6 +9,7 @@
       <Border Background="{TemplateBinding Background}"
               BorderBrush="{TemplateBinding BorderBrush}"
               BorderThickness="{TemplateBinding BorderThickness}"
+              CornerRadius="{TemplateBinding CornerRadius}"
               Padding="{TemplateBinding Padding}">
           <ScrollViewer Classes="menuscroller">
               <ItemsPresenter Name="PART_ItemsPresenter"

src/Avalonia.Themes.Default/DataValidationErrors.xaml

@@ -12,6 +12,7 @@
                           Background="{TemplateBinding Background}"
                           BorderBrush="{TemplateBinding BorderBrush}"
                           BorderThickness="{TemplateBinding BorderThickness}"
+                          CornerRadius="{TemplateBinding CornerRadius}"
                           ContentTemplate="{TemplateBinding ContentTemplate}"
                           Content="{TemplateBinding Content}"
                           Padding="{TemplateBinding Padding}"/>

src/Avalonia.Themes.Default/DatePicker.xaml

@@ -134,6 +134,7 @@
                   Background="{TemplateBinding Background}"
                   BorderBrush="{TemplateBinding BorderBrush}"
                   BorderThickness="{TemplateBinding BorderThickness}"
+                  CornerRadius="{TemplateBinding CornerRadius}"
                   IsEnabled="{TemplateBinding IsEnabled}"
                   MinWidth="{DynamicResource DatePickerThemeMinWidth}"
                   MaxWidth="{DynamicResource DatePickerThemeMaxWidth}"
@@ -148,6 +149,7 @@
                                   BorderBrush="{TemplateBinding BorderBrush}"
                                   Background="{TemplateBinding Background}"
                                   BorderThickness="{TemplateBinding BorderThickness}"
+                                  CornerRadius="{TemplateBinding CornerRadius}"
                                   Content="{TemplateBinding Content}"
                                   TextBlock.Foreground="{TemplateBinding Foreground}"
                                   HorizontalContentAlignment="Stretch"
@@ -242,6 +244,7 @@
         <Border Name="Background" Background="{TemplateBinding Background}"
                 BorderBrush="{TemplateBinding BorderBrush}"
                 BorderThickness="{TemplateBinding BorderThickness}"
+                CornerRadius="{TemplateBinding CornerRadius}"
                 Padding="{DynamicResource DateTimeFlyoutBorderPadding}"
                 MaxHeight="398">
           <Grid Name="ContentRoot" RowDefinitions="*,Auto">

src/Avalonia.Themes.Default/Expander.xaml

@@ -10,7 +10,10 @@
   <Style Selector="Expander[ExpandDirection=Down]">
     <Setter Property="Template">
       <ControlTemplate>
-        <Border Background="{TemplateBinding Background}">
+        <Border Background="{TemplateBinding Background}"
+                BorderBrush="{TemplateBinding BorderBrush}"
+                BorderThickness="{TemplateBinding BorderThickness}"
+                CornerRadius="{TemplateBinding CornerRadius}">
           <Grid RowDefinitions="Auto,*">
             <ToggleButton Name="PART_toggle" Grid.Row="0"  Content="{TemplateBinding Header}" IsChecked="{TemplateBinding IsExpanded, Mode=TwoWay}" />
             <ContentPresenter Name="PART_ContentPresenter"

src/Avalonia.Themes.Default/GridSplitter.xaml

@@ -15,6 +15,7 @@
         <Border 
           BorderBrush="{TemplateBinding BorderBrush}"
           BorderThickness="{TemplateBinding BorderThickness}"
+          CornerRadius="{TemplateBinding CornerRadius}"
           Background="{TemplateBinding Background}"/>
       </ControlTemplate>
     </Setter>

src/Avalonia.Themes.Default/ItemsControl.xaml

@@ -4,6 +4,7 @@
       <Border Background="{TemplateBinding Background}"
               BorderBrush="{TemplateBinding BorderBrush}"
               BorderThickness="{TemplateBinding BorderThickness}"
+              CornerRadius="{TemplateBinding CornerRadius}"
               Padding="{TemplateBinding Padding}">
         <ItemsPresenter Name="PART_ItemsPresenter"
                         Items="{TemplateBinding Items}"

src/Avalonia.Themes.Default/Label.xaml

@@ -6,6 +6,7 @@
                         Background="{TemplateBinding Background}"
                         BorderBrush="{TemplateBinding BorderBrush}"
                         BorderThickness="{TemplateBinding BorderThickness}"
+                        CornerRadius="{TemplateBinding CornerRadius}"
                         ContentTemplate="{TemplateBinding ContentTemplate}"
                         Content="{TemplateBinding Content}"
                         Padding="{TemplateBinding Padding}"

src/Avalonia.Themes.Default/ListBox.xaml

@@ -9,7 +9,8 @@
   <Setter Property="Template">
     <ControlTemplate>
       <Border Name="border" BorderBrush="{TemplateBinding BorderBrush}"
-              BorderThickness="{TemplateBinding BorderThickness}">
+              BorderThickness="{TemplateBinding BorderThickness}"
+              CornerRadius="{TemplateBinding CornerRadius}">
         <ScrollViewer Name="PART_ScrollViewer"
                       Background="{TemplateBinding Background}"
                       HorizontalScrollBarVisibility="{TemplateBinding (ScrollViewer.HorizontalScrollBarVisibility)}"

src/Avalonia.Themes.Default/ListBoxItem.xaml

@@ -10,6 +10,7 @@
                           Background="{TemplateBinding Background}"
                           BorderBrush="{TemplateBinding BorderBrush}"
                           BorderThickness="{TemplateBinding BorderThickness}"
+                          CornerRadius="{TemplateBinding CornerRadius}"
                           ContentTemplate="{TemplateBinding ContentTemplate}"
                           Content="{TemplateBinding Content}"
                           Padding="{TemplateBinding Padding}"

src/Avalonia.Themes.Default/Menu.xaml

@@ -4,6 +4,7 @@
       <Border Background="{TemplateBinding Background}"
               BorderBrush="{TemplateBinding BorderBrush}"
               BorderThickness="{TemplateBinding BorderThickness}"
+              CornerRadius="{TemplateBinding CornerRadius}"
               Padding="{TemplateBinding Padding}">
         <ItemsPresenter Name="PART_ItemsPresenter" 
                         Items="{TemplateBinding Items}" 
@@ -13,4 +14,4 @@
       </Border>
     </ControlTemplate>
   </Setter>
-</Style>
+</Style>

src/Avalonia.Themes.Default/MenuItem.xaml

@@ -14,7 +14,8 @@
         <Border Name="root"
                 Background="{TemplateBinding Background}"
                 BorderBrush="{TemplateBinding BorderBrush}"
-                BorderThickness="{TemplateBinding BorderThickness}">
+                BorderThickness="{TemplateBinding BorderThickness}"
+                CornerRadius="{TemplateBinding CornerRadius}">
           <Grid>
             <Grid.ColumnDefinitions>
               <ColumnDefinition Width="20"/>
@@ -96,7 +97,8 @@
         <Border Name="root"
                 Background="{TemplateBinding Background}"
                 BorderBrush="{TemplateBinding BorderBrush}"
-                BorderThickness="{TemplateBinding BorderThickness}">
+                BorderThickness="{TemplateBinding BorderThickness}"
+                CornerRadius="{TemplateBinding CornerRadius}">
           <Panel>
             <ContentPresenter Name="PART_HeaderPresenter"
                               Content="{TemplateBinding Header}"

src/Avalonia.Themes.Default/NotificationCard.xaml

@@ -12,6 +12,7 @@
                     <Border Background="{TemplateBinding Background}" 
                             BorderBrush="{TemplateBinding BorderBrush}" 
                             BorderThickness="{TemplateBinding BorderThickness}"
+                            CornerRadius="{TemplateBinding CornerRadius}"
                             Margin="8,8,0,0">
                         <ContentControl Name="PART_Content" Content="{TemplateBinding Content}" />
                     </Border>

src/Avalonia.Themes.Default/NumericUpDown.xaml

@@ -9,6 +9,7 @@
         <ButtonSpinner Name="PART_Spinner"
                        Background="{TemplateBinding Background}"
                        BorderThickness="{TemplateBinding BorderThickness}"
+                       CornerRadius="{TemplateBinding CornerRadius}"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        HorizontalContentAlignment="Stretch"
                        VerticalContentAlignment="Stretch"
@@ -18,7 +19,6 @@
           <TextBox Name="PART_TextBox"
                    BorderThickness="0"
                    Background="{TemplateBinding Background}" 
-                   BorderBrush="{TemplateBinding BorderBrush}"
                    Padding="{TemplateBinding Padding}"
                    Watermark="{TemplateBinding Watermark}"
                    DataValidationErrors.Errors="{TemplateBinding (DataValidationErrors.Errors)}"

src/Avalonia.Themes.Default/ProgressBar.xaml

@@ -16,7 +16,7 @@
     <Setter Property="Template">
       <ControlTemplate>
         <Grid>
-          <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
+          <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="{TemplateBinding CornerRadius}">
             <Panel>
               <Border Name="PART_Indicator" Background="{TemplateBinding Foreground}" IsVisible="{Binding !IsIndeterminate, RelativeSource={RelativeSource TemplatedParent}}"/>
               <Border Name="PART_IndeterminateIndicator" Background="{TemplateBinding Foreground}" IsVisible="{Binding IsIndeterminate, RelativeSource={RelativeSource TemplatedParent}}"/>

src/Avalonia.Themes.Default/RepeatButton.xaml

@@ -20,6 +20,7 @@
                                   Background="{TemplateBinding Background}"
                                   BorderBrush="{TemplateBinding BorderBrush}"
                                   BorderThickness="{TemplateBinding BorderThickness}"
+                                  CornerRadius="{TemplateBinding CornerRadius}"
                                   ContentTemplate="{TemplateBinding ContentTemplate}"
                                   Content="{TemplateBinding Content}"
                                   Padding="{TemplateBinding Padding}"

src/Avalonia.Themes.Default/Separator.xaml

@@ -6,6 +6,7 @@
       <ControlTemplate>
         <Border BorderBrush="{TemplateBinding BorderBrush}"
                 BorderThickness="{TemplateBinding BorderThickness}"
+                CornerRadius="{TemplateBinding CornerRadius}"
                 Background="{TemplateBinding Background}"/>
       </ControlTemplate>
     </Setter>

src/Avalonia.Themes.Default/TabControl.xaml

@@ -3,9 +3,9 @@
         <Setter Property="Template">
             <ControlTemplate>
                 <Border
-                    Margin="{TemplateBinding Margin}"
                     BorderBrush="{TemplateBinding BorderBrush}"
                     BorderThickness="{TemplateBinding BorderThickness}"
+                    CornerRadius="{TemplateBinding CornerRadius}"
                     Background="{TemplateBinding Background}"
                     HorizontalAlignment="{TemplateBinding HorizontalAlignment}"
                     VerticalAlignment="{TemplateBinding VerticalAlignment}">

src/Avalonia.Themes.Default/TabItem.xaml

@@ -12,11 +12,11 @@
                     Background="{TemplateBinding Background}"
                     BorderBrush="{TemplateBinding BorderBrush}"
                     BorderThickness="{TemplateBinding BorderThickness}"
+                    CornerRadius="{TemplateBinding CornerRadius}"
                     ContentTemplate="{TemplateBinding HeaderTemplate}"
                     Content="{TemplateBinding Header}"
                     HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
                     VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
-                    Margin="{TemplateBinding Margin}"
                     Padding="{TemplateBinding Padding}"/>
             </ControlTemplate>
         </Setter>

src/Avalonia.Themes.Default/TabStripItem.xaml

@@ -9,6 +9,7 @@
                           Background="{TemplateBinding Background}"
                           BorderBrush="{TemplateBinding BorderBrush}"
                           BorderThickness="{TemplateBinding BorderThickness}"
+                          CornerRadius="{TemplateBinding CornerRadius}"
                           ContentTemplate="{TemplateBinding ContentTemplate}"
                           Content="{TemplateBinding Content}"
                           HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
@@ -20,4 +21,4 @@
   <Style Selector="TabStripItem:selected">
     <Setter Property="Foreground" Value="{DynamicResource ThemeForegroundBrush}"/>
   </Style>
-</Styles>
+</Styles>

src/Avalonia.Themes.Default/TextBox.xaml

@@ -30,7 +30,8 @@
         <Border Name="border"
                 Background="{TemplateBinding Background}"
                 BorderBrush="{TemplateBinding BorderBrush}"
-                BorderThickness="{TemplateBinding BorderThickness}">
+                BorderThickness="{TemplateBinding BorderThickness}"
+                CornerRadius="{TemplateBinding CornerRadius}">
           <DockPanel Margin="{TemplateBinding Padding}"
                      HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                      VerticalAlignment="{TemplateBinding VerticalContentAlignment}">

src/Avalonia.Themes.Default/TimePicker.xaml

@@ -58,6 +58,7 @@
                   Background="{TemplateBinding Background}"
                   BorderBrush="{TemplateBinding BorderBrush}"
                   BorderThickness="{TemplateBinding BorderThickness}"
+                  CornerRadius="{TemplateBinding CornerRadius}"
                   IsEnabled="{TemplateBinding IsEnabled}"
                   MinWidth="{DynamicResource TimePickerThemeMinWidth}"
                   MaxWidth="{DynamicResource TimePickerThemeMaxWidth}"
@@ -71,6 +72,7 @@
                                 BorderBrush="{TemplateBinding BorderBrush}"
                                 Background="{TemplateBinding Background}"
                                 BorderThickness="{TemplateBinding BorderThickness}"
+                                CornerRadius="{TemplateBinding CornerRadius}"
                                 Content="{TemplateBinding Content}"
                                 TextBlock.Foreground="{TemplateBinding Foreground}"
                                 HorizontalContentAlignment="Stretch"
@@ -178,6 +180,7 @@
                 Background="{TemplateBinding Background}"
                 BorderBrush="{TemplateBinding BorderBrush}"
                 BorderThickness="{TemplateBinding BorderThickness}"
+                CornerRadius="{TemplateBinding CornerRadius}"
                 Padding="{DynamicResource DateTimeFlyoutBorderPadding}"
                 MaxHeight="398">
           <Grid Name="ContentPanel" RowDefinitions="*,Auto">

src/Avalonia.Themes.Default/ToggleButton.xaml

@@ -13,6 +13,7 @@
                           Background="{TemplateBinding Background}"
                           BorderBrush="{TemplateBinding BorderBrush}"
                           BorderThickness="{TemplateBinding BorderThickness}"
+                          CornerRadius="{TemplateBinding CornerRadius}"
                           ContentTemplate="{TemplateBinding ContentTemplate}"
                           Content="{TemplateBinding Content}"
                           Padding="{TemplateBinding Padding}"
@@ -35,4 +36,4 @@
   <Style Selector="ToggleButton:disabled">
     <Setter Property="Opacity" Value="{DynamicResource ThemeDisabledOpacity}"/>
   </Style>
-</Styles>
+</Styles>

src/Avalonia.Themes.Default/ToolTip.xaml

@@ -9,9 +9,10 @@
                         Background="{TemplateBinding Background}"
                         BorderBrush="{TemplateBinding BorderBrush}"
                         BorderThickness="{TemplateBinding BorderThickness}"
+                        CornerRadius="{TemplateBinding CornerRadius}"
                         ContentTemplate="{TemplateBinding ContentTemplate}"
                         Content="{TemplateBinding Content}" 
                         Padding="{TemplateBinding Padding}"/>
     </ControlTemplate>
   </Setter>
-</Style>
+</Style>

src/Avalonia.Themes.Default/TreeView.xaml

@@ -8,7 +8,8 @@
   <Setter Property="Template">
     <ControlTemplate>
       <Border BorderBrush="{TemplateBinding BorderBrush}"
-              BorderThickness="{TemplateBinding BorderThickness}">
+              BorderThickness="{TemplateBinding BorderThickness}"
+              CornerRadius="{TemplateBinding CornerRadius}">
         <ScrollViewer Background="{TemplateBinding Background}"
                       HorizontalScrollBarVisibility="{TemplateBinding (ScrollViewer.HorizontalScrollBarVisibility)}"
                       VerticalScrollBarVisibility="{TemplateBinding (ScrollViewer.VerticalScrollBarVisibility)}"

src/Avalonia.Themes.Default/TreeViewItem.xaml

@@ -15,6 +15,7 @@
                             Background="{TemplateBinding Background}"
                             BorderBrush="{TemplateBinding BorderBrush}"
                             BorderThickness="{TemplateBinding BorderThickness}"
+                            CornerRadius="{TemplateBinding CornerRadius}"
                             TemplatedControl.IsTemplateFocusTarget="True">
                         <Grid Name="PART_Header"
                               ColumnDefinitions="16, *"

src/Avalonia.Themes.Default/UserControl.xaml

@@ -5,6 +5,7 @@
                         Background="{TemplateBinding Background}"
                         BorderBrush="{TemplateBinding BorderBrush}"
                         BorderThickness="{TemplateBinding BorderThickness}"
+                        CornerRadius="{TemplateBinding CornerRadius}"
                         ContentTemplate="{TemplateBinding ContentTemplate}"
                         Content="{TemplateBinding Content}"
                         Padding="{TemplateBinding Padding}"

src/Avalonia.Themes.Fluent/Controls/AutoCompleteBox.xaml

@@ -22,7 +22,8 @@
     <Setter Property="Foreground" Value="{DynamicResource TextControlForeground}" />
     <Setter Property="Background" Value="{DynamicResource TextControlBackground}" />
     <Setter Property="BorderBrush" Value="{DynamicResource TextControlBorderBrush}" />
-    <Setter Property="BorderThickness" Value="{DynamicResource TextControlBorderThemeThickness}" />    
+    <Setter Property="BorderThickness" Value="{DynamicResource TextControlBorderThemeThickness}" />
+    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
     <Setter Property="FontSize" Value="{DynamicResource ControlContentThemeFontSize}" />
     <Setter Property="Padding" Value="{DynamicResource TextControlThemePadding}" />
     <Setter Property="MaxDropDownHeight" Value="{DynamicResource AutoCompleteListMaxHeight}" />
@@ -36,6 +37,7 @@
                    Background="{TemplateBinding Background}"
                    BorderBrush="{TemplateBinding BorderBrush}"
                    BorderThickness="{TemplateBinding BorderThickness}"
+                   CornerRadius="{TemplateBinding CornerRadius}"
                    FontSize="{TemplateBinding FontSize}"
                    FontFamily="{TemplateBinding FontFamily}"
                    FontWeight="{TemplateBinding FontWeight}"

src/Avalonia.Themes.Fluent/Controls/Button.xaml

@@ -16,6 +16,7 @@
     <Setter Property="Foreground" Value="{DynamicResource ButtonForeground}" />
     <Setter Property="BorderBrush" Value="{DynamicResource ButtonBorderBrush}" />
     <Setter Property="BorderThickness" Value="{DynamicResource ButtonBorderThemeThickness}" />
+    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
     <Setter Property="Padding" Value="{DynamicResource ButtonPadding}" />
     <Setter Property="HorizontalAlignment" Value="Left" />
     <Setter Property="VerticalAlignment" Value="Center" />    
@@ -29,6 +30,7 @@
                           Background="{TemplateBinding Background}"
                           BorderBrush="{TemplateBinding BorderBrush}"
                           BorderThickness="{TemplateBinding BorderThickness}"
+                          CornerRadius="{TemplateBinding CornerRadius}"
                           Content="{TemplateBinding Content}"
                           ContentTemplate="{TemplateBinding ContentTemplate}"
                           Padding="{TemplateBinding Padding}"
@@ -93,8 +95,4 @@
     <Setter Property="BorderBrush" Value="{DynamicResource AccentButtonBorderBrushDisabled}" />
     <Setter Property="TextBlock.Foreground" Value="{DynamicResource AccentButtonForegroundDisabled}" />
   </Style>
-  
-  <Style Selector="Button /template/ ContentPresenter#PART_ContentPresenter">
-    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
-  </Style>
 </Styles>

src/Avalonia.Themes.Fluent/Controls/ButtonSpinner.xaml

@@ -58,6 +58,7 @@
     <Setter Property="Background" Value="{DynamicResource TextControlBackground}" />
     <Setter Property="BorderBrush" Value="{DynamicResource TextControlBorderBrush}" />
     <Setter Property="BorderThickness" Value="{DynamicResource TextControlBorderThemeThickness}" />
+    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
     <Setter Property="MinHeight" Value="{DynamicResource TextControlThemeMinHeight}" />
     <Setter Property="MinWidth" Value="{DynamicResource TextControlThemeMinWidth}" />    
     <Setter Property="FontSize" Value="{DynamicResource ControlContentThemeFontSize}" />
@@ -69,7 +70,7 @@
           <Border Background="{TemplateBinding Background}"
                   BorderBrush="{TemplateBinding BorderBrush}"
                   BorderThickness="{TemplateBinding BorderThickness}"
-                  CornerRadius="{DynamicResource ControlCornerRadius}"
+                  CornerRadius="{TemplateBinding CornerRadius}"
                   MinHeight="{TemplateBinding MinHeight}">
             <Grid ColumnDefinitions="Auto,*,Auto">
               <ContentPresenter Name="PART_ContentPresenter"

src/Avalonia.Themes.Fluent/Controls/Calendar.xaml

@@ -5,7 +5,12 @@
 // All other rights reserved.
 -->
 
-<Styles xmlns="https://github.com/avaloniaui">  
+<Styles xmlns="https://github.com/avaloniaui">
+  <Design.PreviewWith>
+    <Border Padding="20">
+      <Calendar />
+    </Border>
+  </Design.PreviewWith>
   <Style Selector="Calendar">
     <Setter Property="Foreground" Value="{DynamicResource CalendarViewForeground}" />
     <Setter Property="Background" Value="{DynamicResource CalendarViewBackground}" />
@@ -23,7 +28,8 @@
                         Background="{TemplateBinding Background}"
                         BorderBrush="{TemplateBinding BorderBrush}"
                         BorderThickness="{TemplateBinding BorderThickness}"
-                        HeaderBackground="{TemplateBinding HeaderBackground}"/>
+                        HeaderBackground="{TemplateBinding HeaderBackground}"
+                        CornerRadius="{TemplateBinding CornerRadius}"/>
 
         </StackPanel>
       </ControlTemplate>

src/Avalonia.Themes.Fluent/Controls/CalendarDatePicker.xaml

@@ -26,6 +26,7 @@
     <Setter Property="Foreground" Value="{DynamicResource CalendarDatePickerForeground}"/>
     <Setter Property="BorderBrush" Value="{DynamicResource CalendarDatePickerBorderBrush}"/>
     <Setter Property="BorderThickness" Value="{DynamicResource CalendarDatePickerBorderThemeThickness}"/>
+    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
     <Setter Property="HorizontalAlignment" Value="Left" />
     <Setter Property="VerticalAlignment" Value="Center" />
     <Setter Property="Padding" Value="4"/>
@@ -102,6 +103,7 @@
                    Background="{TemplateBinding Background}" 
                    BorderBrush="{TemplateBinding BorderBrush}" 
                    BorderThickness="{TemplateBinding BorderThickness}" 
+                   CornerRadius="{TemplateBinding CornerRadius}"
                    Padding="{TemplateBinding Padding}"
                    Watermark="{TemplateBinding Watermark}"
                    UseFloatingWatermark="{TemplateBinding UseFloatingWatermark}"

src/Avalonia.Themes.Fluent/Controls/CalendarItem.xaml

@@ -7,7 +7,13 @@
 
 <Styles xmlns="https://github.com/avaloniaui"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+  <Design.PreviewWith>
+    <Border Padding="20">
+      <Calendar />
+    </Border>
+  </Design.PreviewWith>
   <Style Selector="CalendarItem">
+    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
     <Setter Property="DayTitleTemplate">
       <Template>
         <TextBlock Text="{Binding}"
@@ -21,7 +27,7 @@
         <Border BorderThickness="{TemplateBinding BorderThickness}"
                 Background="{TemplateBinding Background}"
                 BorderBrush="{TemplateBinding BorderBrush}"
-                CornerRadius="{DynamicResource ControlCornerRadius}">
+                CornerRadius="{TemplateBinding CornerRadius}">
           <Border.Styles>
             <Style Selector="Button.CalendarHeader">
               <Setter Property="HorizontalAlignment" Value="Stretch" />

src/Avalonia.Themes.Fluent/Controls/Carousel.xaml

@@ -3,7 +3,8 @@
     <ControlTemplate>
       <Border Background="{TemplateBinding Background}"
               BorderBrush="{TemplateBinding BorderBrush}"
-              BorderThickness="{TemplateBinding BorderThickness}">
+              BorderThickness="{TemplateBinding BorderThickness}"
+              CornerRadius="{TemplateBinding CornerRadius}">
         <CarouselPresenter IsVirtualized="{TemplateBinding IsVirtualized}"
                            Items="{TemplateBinding Items}"
                            ItemsPanel="{TemplateBinding ItemsPanel}"

src/Avalonia.Themes.Fluent/Controls/CheckBox.xaml

@@ -11,6 +11,7 @@
     <Setter Property="HorizontalContentAlignment" Value="Left" />
     <Setter Property="VerticalContentAlignment" Value="Center" />    
     <Setter Property="FontSize" Value="{DynamicResource ControlContentThemeFontSize}" />
+    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
     <Setter Property="MinHeight" Value="32" />
     <!--<Setter Property="UseSystemFocusVisuals" Value="{StaticResource UseSystemFocusVisuals}" />
     <Setter Property="FocusVisualMargin" Value="-7,-3,-7,-3" />-->
@@ -21,11 +22,13 @@
                   Grid.ColumnSpan="2"
                   Background="{TemplateBinding Background}"
                   BorderBrush="{TemplateBinding BorderBrush}"
-                  BorderThickness="{TemplateBinding BorderThickness}" />
+                  BorderThickness="{TemplateBinding BorderThickness}"
+                  CornerRadius="{TemplateBinding CornerRadius}" />
 
           <Grid VerticalAlignment="Top" Height="32">
             <Border x:Name="NormalRectangle"
                 BorderThickness="{DynamicResource CheckBoxBorderThemeThickness}"
+                CornerRadius="{TemplateBinding CornerRadius}"
                 UseLayoutRounding="False"
                 Height="20"
                 Width="20" />
@@ -49,14 +52,6 @@
       </ControlTemplate>
     </Setter>
   </Style>
-  
-  <Style Selector="CheckBox /template/ Border#PART_Border">
-    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
-  </Style>
-
-  <Style Selector="CheckBox /template/ Border#NormalRectangle">
-    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
-  </Style>
 
   <!-- Unchecked Normal State -->
   <Style Selector="CheckBox">

src/Avalonia.Themes.Fluent/Controls/ComboBox.xaml

@@ -34,6 +34,7 @@
     <Setter Property="Background" Value="{DynamicResource ComboBoxBackground}" />
     <Setter Property="BorderBrush" Value="{DynamicResource ComboBoxBorderBrush}" />
     <Setter Property="BorderThickness" Value="{DynamicResource ComboBoxBorderThemeThickness}" />
+    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
     <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Disabled" />
     <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto" />
     <Setter Property="HorizontalContentAlignment" Value="Stretch" />
@@ -62,6 +63,7 @@
                     Background="{TemplateBinding Background}"
                     BorderBrush="{TemplateBinding BorderBrush}"
                     BorderThickness="{TemplateBinding BorderThickness}"
+                    CornerRadius="{TemplateBinding CornerRadius}"
                     MinWidth="{DynamicResource ComboBoxThemeMinWidth}" />
 
             <Border x:Name="HighlightBackground"
@@ -70,7 +72,8 @@
                     Grid.ColumnSpan="2"
                     Background="{DynamicResource ComboBoxBackgroundUnfocused}"
                     BorderBrush="{DynamicResource ComboBoxBackgroundBorderBrushUnfocused}"
-                    BorderThickness="{TemplateBinding BorderThickness}" />
+                    BorderThickness="{TemplateBinding BorderThickness}"
+                    CornerRadius="{TemplateBinding CornerRadius}" />
             <TextBlock x:Name="PlaceholderTextBlock"
                        Grid.Row="1"
                        Grid.Column="0"
@@ -227,14 +230,6 @@
     <Setter Property="Fill" Value="{DynamicResource ComboBoxDropDownGlyphForegroundFocusedPressed}" />
   </Style>
   
-  <Style Selector="ComboBox /template/ Border#Background">
-    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
-  </Style>
-  
-  <Style Selector="ComboBox /template/ Border#HighlightBackground">
-    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
-  </Style>
-  
   <!-- Error State -->
   <Style Selector="ComboBox:error /template/ Border#Background">
     <Setter Property="BorderBrush" Value="{DynamicResource SystemControlErrorTextForegroundBrush}"/>

src/Avalonia.Themes.Fluent/Controls/ComboBoxItem.xaml

@@ -29,6 +29,7 @@
                           Background="{TemplateBinding Background}"
                           BorderBrush="{TemplateBinding BorderBrush}"
                           BorderThickness="{TemplateBinding BorderThickness}"
+                          CornerRadius="{TemplateBinding CornerRadius}"
                           ContentTemplate="{TemplateBinding ContentTemplate}"
                           Content="{TemplateBinding Content}"
                           HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"

src/Avalonia.Themes.Fluent/Controls/ContentControl.xaml

@@ -5,6 +5,7 @@
                         Background="{TemplateBinding Background}"
                         BorderBrush="{TemplateBinding BorderBrush}"
                         BorderThickness="{TemplateBinding BorderThickness}"
+                        CornerRadius="{TemplateBinding CornerRadius}"
                         ContentTemplate="{TemplateBinding ContentTemplate}"
                         Content="{TemplateBinding Content}"
                         Padding="{TemplateBinding Padding}"
@@ -12,4 +13,4 @@
                         HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"/>
     </ControlTemplate>
   </Setter>
-</Style>
+</Style>

src/Avalonia.Themes.Fluent/Controls/ContextMenu.xaml

@@ -39,6 +39,7 @@
   <Setter Property="Background" Value="{DynamicResource MenuFlyoutPresenterBackground}" />
   <Setter Property="BorderBrush" Value="{DynamicResource MenuFlyoutPresenterBorderBrush}" />
   <Setter Property="BorderThickness" Value="{DynamicResource MenuFlyoutPresenterBorderThemeThickness}" />
+  <Setter Property="CornerRadius" Value="{DynamicResource OverlayCornerRadius}" />
   <Setter Property="MaxWidth" Value="{DynamicResource FlyoutThemeMaxWidth}" />
   <Setter Property="MinHeight" Value="{DynamicResource MenuFlyoutThemeMinHeight}" />
   <Setter Property="Padding" Value="{DynamicResource MenuFlyoutPresenterThemePadding}" />
@@ -55,7 +56,7 @@
               MaxWidth="{TemplateBinding MaxWidth}"
               MinHeight="{TemplateBinding MinHeight}"
               HorizontalAlignment="{TemplateBinding HorizontalAlignment}"
-              CornerRadius="{DynamicResource OverlayCornerRadius}">
+              CornerRadius="{TemplateBinding CornerRadius}">
         <ScrollViewer Classes="menuscroller">
           <ItemsPresenter Name="PART_ItemsPresenter"
                           Items="{TemplateBinding Items}"

src/Avalonia.Themes.Fluent/Controls/DataValidationErrors.xaml

@@ -48,6 +48,7 @@
                             Padding="{TemplateBinding Padding}"
                             Background="{TemplateBinding Background}"
                             BorderThickness="{TemplateBinding BorderThickness}"
+                            CornerRadius="{TemplateBinding CornerRadius}"
                             Content="{TemplateBinding Content}"
                             ContentTemplate="{TemplateBinding ContentTemplate}" />
         </DockPanel>
@@ -88,6 +89,7 @@
                             Background="{TemplateBinding Background}"
                             BorderBrush="{TemplateBinding BorderBrush}"
                             BorderThickness="{TemplateBinding BorderThickness}"
+                            CornerRadius="{TemplateBinding CornerRadius}"
                             Content="{TemplateBinding Content}"
                             ContentTemplate="{TemplateBinding ContentTemplate}" />
         </DockPanel>

src/Avalonia.Themes.Fluent/Controls/DatePicker.xaml

@@ -8,6 +8,12 @@
 <Styles xmlns="https://github.com/avaloniaui"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:sys="clr-namespace:System;assembly=netstandard">
+  <Design.PreviewWith>
+    <Border Padding="20">
+      <DatePicker CornerRadius="10" />
+    </Border>
+  </Design.PreviewWith>
+  
   <Styles.Resources>
     <Thickness x:Key="DatePickerTopHeaderMargin">0,0,0,4</Thickness>
     <x:Double x:Key="DatePickerFlyoutPresenterHighlightHeight">40</x:Double>
@@ -50,6 +56,7 @@
     <Setter Property="Background" Value="{DynamicResource DateTimePickerFlyoutButtonBackground}" />
     <Setter Property="HorizontalContentAlignment" Value="Center"/>
     <Setter Property="VerticalContentAlignment" Value="Center"/>
+    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
     <Setter Property="Template">
       <ControlTemplate>
         <!-- 
@@ -67,7 +74,7 @@
                   Padding="{TemplateBinding Padding}"
                   HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
                   VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
-                  CornerRadius="{DynamicResource ControlCornerRadius}"/>
+                  CornerRadius="{TemplateBinding CornerRadius}"/>
         </Border>
       </ControlTemplate>
     </Setter>
@@ -121,6 +128,7 @@
     <Setter Property="Background" Value="{DynamicResource DatePickerButtonBackground}"/>
     <Setter Property="BorderBrush" Value="{DynamicResource DatePickerButtonBorderBrush}"/>
     <Setter Property="BorderThickness" Value="1"/>
+    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
     <Setter Property="HorizontalAlignment" Value="Left" />
     <Setter Property="VerticalAlignment" Value="Center" />
     <Setter Property="Template">
@@ -140,6 +148,7 @@
                     Background="{TemplateBinding Background}"
                     BorderBrush="{TemplateBinding BorderBrush}"
                     BorderThickness="{TemplateBinding BorderThickness}"
+                    CornerRadius="{TemplateBinding CornerRadius}"
                     IsEnabled="{TemplateBinding IsEnabled}"
                     MinWidth="{DynamicResource DatePickerThemeMinWidth}"
                     MaxWidth="{DynamicResource DatePickerThemeMaxWidth}"
@@ -158,7 +167,7 @@
                                     TextBlock.Foreground="{TemplateBinding Foreground}"
                                     HorizontalContentAlignment="Stretch"
                                     VerticalContentAlignment="Stretch"
-                                    CornerRadius="{DynamicResource ControlCornerRadius}"/>
+                                    CornerRadius="{TemplateBinding CornerRadius}"/>
                 </ControlTemplate>
               </Button.Template>
               <Grid Name="ButtonContentGrid" ColumnDefinitions="78*,Auto,132*,Auto,78*">
@@ -246,13 +255,14 @@
     <Setter Property="Background" Value="{DynamicResource DatePickerFlyoutPresenterBackground}" />
     <Setter Property="BorderBrush" Value="{DynamicResource DatePickerFlyoutPresenterBorderBrush}" />
     <Setter Property="BorderThickness" Value="{DynamicResource DateTimeFlyoutBorderThickness}" />
+    <Setter Property="CornerRadius" Value="{DynamicResource OverlayCornerRadius}" />
     <Setter Property="Template">
       <ControlTemplate>
         <Border Name="Background" Background="{TemplateBinding Background}"
                 BorderBrush="{TemplateBinding BorderBrush}"
                 BorderThickness="{TemplateBinding BorderThickness}"
                 Padding="{DynamicResource DateTimeFlyoutBorderPadding}"
-                MaxHeight="398" CornerRadius="{DynamicResource OverlayCornerRadius}">
+                MaxHeight="398" CornerRadius="{TemplateBinding CornerRadius}">
           <Grid Name="ContentRoot" RowDefinitions="*,Auto">
             <Grid Name="PickerContainer">
               <!--Column Definitions set in code, ignore here-->

src/Avalonia.Themes.Fluent/Controls/Expander.xaml

@@ -1,23 +1,23 @@
 <Styles xmlns="https://github.com/avaloniaui" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
   <Design.PreviewWith>
     <Border Padding="20">
-      <StackPanel Orientation="Vertical" Spacing="20">
+      <StackPanel Orientation="Vertical" Spacing="20" Width="350">
-        <Expander ExpandDirection="Up" Header="Expand Up">
+        <Expander ExpandDirection="Up" Header="Expand Up" CornerRadius="25">
           <StackPanel>
             <TextBlock>Expanded content</TextBlock>
           </StackPanel>
         </Expander>
-        <Expander ExpandDirection="Down" Header="Expand Down">
+        <Expander ExpandDirection="Down" Header="Expand Down" CornerRadius="25">
           <StackPanel>
             <TextBlock>Expanded content</TextBlock>
           </StackPanel>
         </Expander>
-        <Expander ExpandDirection="Left" Header="Expand Left">
+        <Expander ExpandDirection="Left" Header="Expand Left" CornerRadius="25">
           <StackPanel>
             <TextBlock>Expanded content</TextBlock>
           </StackPanel>
         </Expander>
-        <Expander ExpandDirection="Right" Header="Expand Right">
+        <Expander ExpandDirection="Right" Header="Expand Right" CornerRadius="25">
           <StackPanel>
             <TextBlock>Expanded content</TextBlock>
           </StackPanel>
@@ -51,6 +51,7 @@
     <Setter Property="Background" Value="{DynamicResource ExpanderBackground}" />
     <Setter Property="BorderThickness" Value="{DynamicResource ExpanderBorderThickness}" />
     <Setter Property="BorderBrush" Value="{DynamicResource ExpanderBorderBrush}" />
+    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
     <Setter Property="Padding" Value="{DynamicResource ExpanderHeaderPadding}" />
     <Setter Property="HorizontalAlignment" Value="Stretch" />
     <Setter Property="HorizontalContentAlignment" Value="Left" />
@@ -140,31 +141,31 @@
   </Style>
 
   <Style Selector="Expander:not(:expanded) /template/ ToggleButton#ExpanderHeader /template/ Border#ToggleButtonBackground">
-    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
+    <Setter Property="CornerRadius" Value="{Binding $parent[Expander].CornerRadius}" />
   </Style>
   <Style Selector="Expander:expanded:up /template/ ToggleButton#ExpanderHeader /template/ Border#ToggleButtonBackground">
-    <Setter Property="CornerRadius" Value="{Binding Source={StaticResource ControlCornerRadius}, Converter={StaticResource BottomCornerRadiusFilterConverter}}" />
+    <Setter Property="CornerRadius" Value="{Binding $parent[Expander].CornerRadius, Converter={StaticResource BottomCornerRadiusFilterConverter}}" />
   </Style>
   <Style Selector="Expander:expanded:up /template/ Border#ExpanderContent">
-    <Setter Property="CornerRadius" Value="{Binding Source={StaticResource ControlCornerRadius}, Converter={StaticResource TopCornerRadiusFilterConverter}}" />
+    <Setter Property="CornerRadius" Value="{Binding $parent[Expander].CornerRadius, Converter={StaticResource TopCornerRadiusFilterConverter}}" />
   </Style>
   <Style Selector="Expander:expanded:down /template/ ToggleButton#ExpanderHeader /template/ Border#ToggleButtonBackground">
-    <Setter Property="CornerRadius" Value="{Binding Source={StaticResource ControlCornerRadius}, Converter={StaticResource TopCornerRadiusFilterConverter}}" />
+    <Setter Property="CornerRadius" Value="{Binding $parent[Expander].CornerRadius, Converter={StaticResource TopCornerRadiusFilterConverter}}" />
   </Style>
   <Style Selector="Expander:expanded:down /template/ Border#ExpanderContent">
-    <Setter Property="CornerRadius" Value="{Binding Source={StaticResource ControlCornerRadius}, Converter={StaticResource BottomCornerRadiusFilterConverter}}" />
+    <Setter Property="CornerRadius" Value="{Binding $parent[Expander].CornerRadius, Converter={StaticResource BottomCornerRadiusFilterConverter}}" />
   </Style>
   <Style Selector="Expander:expanded:left /template/ ToggleButton#ExpanderHeader /template/ Border#ToggleButtonBackground">
-    <Setter Property="CornerRadius" Value="{Binding Source={StaticResource ControlCornerRadius}, Converter={StaticResource RightCornerRadiusFilterConverter}}" />
+    <Setter Property="CornerRadius" Value="{Binding $parent[Expander].CornerRadius, Converter={StaticResource RightCornerRadiusFilterConverter}}" />
   </Style>
   <Style Selector="Expander:expanded:left /template/ Border#ExpanderContent">
-    <Setter Property="CornerRadius" Value="{Binding Source={StaticResource ControlCornerRadius}, Converter={StaticResource LeftCornerRadiusFilterConverter}}" />
+    <Setter Property="CornerRadius" Value="{Binding $parent[Expander].CornerRadius, Converter={StaticResource LeftCornerRadiusFilterConverter}}" />
   </Style>
   <Style Selector="Expander:expanded:right /template/ ToggleButton#ExpanderHeader /template/ Border#ToggleButtonBackground">
-    <Setter Property="CornerRadius" Value="{Binding Source={StaticResource ControlCornerRadius}, Converter={StaticResource LeftCornerRadiusFilterConverter}}" />
+    <Setter Property="CornerRadius" Value="{Binding $parent[Expander].CornerRadius, Converter={StaticResource LeftCornerRadiusFilterConverter}}" />
   </Style>
   <Style Selector="Expander:expanded:right /template/ Border#ExpanderContent">
-    <Setter Property="CornerRadius" Value="{Binding Source={StaticResource ControlCornerRadius}, Converter={StaticResource RightCornerRadiusFilterConverter}}" />
+    <Setter Property="CornerRadius" Value="{Binding $parent[Expander].CornerRadius, Converter={StaticResource RightCornerRadiusFilterConverter}}" />
   </Style>
 
   <Style Selector="Expander:left /template/ ToggleButton#ExpanderHeader">

src/Avalonia.Themes.Fluent/Controls/GridSplitter.xaml

@@ -15,6 +15,7 @@
         <Border 
           BorderBrush="{TemplateBinding BorderBrush}"
           BorderThickness="{TemplateBinding BorderThickness}"
+          CornerRadius="{TemplateBinding CornerRadius}"
           Background="{TemplateBinding Background}"/>
       </ControlTemplate>
     </Setter>

src/Avalonia.Themes.Fluent/Controls/ItemsControl.xaml

@@ -4,6 +4,7 @@
       <Border Background="{TemplateBinding Background}"
               BorderBrush="{TemplateBinding BorderBrush}"
               BorderThickness="{TemplateBinding BorderThickness}"
+              CornerRadius="{TemplateBinding CornerRadius}"
               Padding="{TemplateBinding Padding}">
         <ItemsPresenter Name="PART_ItemsPresenter"
                         Items="{TemplateBinding Items}"

src/Avalonia.Themes.Fluent/Controls/Label.xaml

@@ -5,7 +5,8 @@
       <ContentPresenter Name="PART_ContentPresenter"
                         Background="{TemplateBinding Background}"
                         BorderBrush="{TemplateBinding BorderBrush}"
-                        BorderThickness="{TemplateBinding BorderThickness}"
+                        BorderThickness="{TemplateBinding BorderThickness}"                        
+                        CornerRadius="{TemplateBinding CornerRadius}"
                         ContentTemplate="{TemplateBinding ContentTemplate}"
                         Content="{TemplateBinding Content}"
                         Padding="{TemplateBinding Padding}"

src/Avalonia.Themes.Fluent/Controls/ListBox.xaml

@@ -19,10 +19,12 @@
     <Setter Property="FontSize" Value="{DynamicResource ControlContentThemeFontSize}" />    
     <Setter Property="Template">
       <ControlTemplate>
-        <Border Name="border" BorderBrush="{TemplateBinding BorderBrush}"
+        <Border Name="border"
-                BorderThickness="{TemplateBinding BorderThickness}">
+                Background="{TemplateBinding Background}"
+                BorderBrush="{TemplateBinding BorderBrush}"
+                BorderThickness="{TemplateBinding BorderThickness}"
+                CornerRadius="{TemplateBinding CornerRadius}">
           <ScrollViewer Name="PART_ScrollViewer"
-                        Background="{TemplateBinding Background}"
                         HorizontalScrollBarVisibility="{TemplateBinding (ScrollViewer.HorizontalScrollBarVisibility)}"
                         VerticalScrollBarVisibility="{TemplateBinding (ScrollViewer.VerticalScrollBarVisibility)}"
                         AllowAutoHide="{TemplateBinding (ScrollViewer.AllowAutoHide)}">

src/Avalonia.Themes.Fluent/Controls/ListBoxItem.xaml

@@ -25,6 +25,7 @@
                           Background="{TemplateBinding Background}"
                           BorderBrush="{TemplateBinding BorderBrush}"
                           BorderThickness="{TemplateBinding BorderThickness}"
+                          CornerRadius="{TemplateBinding CornerRadius}"
                           ContentTemplate="{TemplateBinding ContentTemplate}"
                           Content="{TemplateBinding Content}"
                           Padding="{TemplateBinding Padding}"

src/Avalonia.Themes.Fluent/Controls/Menu.xaml

@@ -21,6 +21,7 @@
       <Border Background="{TemplateBinding Background}"
               BorderBrush="{TemplateBinding BorderBrush}"
               BorderThickness="{TemplateBinding BorderThickness}"
+              CornerRadius="{TemplateBinding CornerRadius}"
               HorizontalAlignment="Stretch"
               Padding="{TemplateBinding Padding}">
         <ItemsPresenter Name="PART_ItemsPresenter"

src/Avalonia.Themes.Fluent/Controls/MenuItem.xaml

@@ -61,7 +61,8 @@
                   Padding="{TemplateBinding Padding}"
                   Background="{TemplateBinding Background}"
                   BorderBrush="{TemplateBinding BorderBrush}"
-                  BorderThickness="{TemplateBinding BorderThickness}">
+                  BorderThickness="{TemplateBinding BorderThickness}"
+                  CornerRadius="{TemplateBinding CornerRadius}">
             <Grid>
               <Grid.ColumnDefinitions>
                 <ColumnDefinition Width="Auto"
@@ -143,7 +144,8 @@
         <Border Name="PART_LayoutRoot"
                 Background="{TemplateBinding Background}"
                 BorderBrush="{TemplateBinding BorderBrush}"
-                BorderThickness="{TemplateBinding BorderThickness}">
+                BorderThickness="{TemplateBinding BorderThickness}"
+                CornerRadius="{TemplateBinding CornerRadius}">
           <Panel>
             <ContentPresenter Name="PART_HeaderPresenter"
                               Content="{TemplateBinding Header}"

src/Avalonia.Themes.Fluent/Controls/NotificationCard.xaml

@@ -12,7 +12,8 @@
     <Setter Property="Foreground" Value="White"/>
     <Setter Property="RenderTransformOrigin" Value="50%,75%"/>
     <Setter Property="BorderThickness" Value="0" />
-    <Setter Property="Background" Value="{DynamicResource NotificationCardBackgroundBrush}" />    
+    <Setter Property="Background" Value="{DynamicResource NotificationCardBackgroundBrush}" />
+    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
     <Setter Property="Template">
       <ControlTemplate>
         <LayoutTransformControl Name="PART_LayoutTransformControl" UseRenderTransform="True">
@@ -20,7 +21,8 @@
             <Border Background="{TemplateBinding Background}"
                     BorderBrush="{TemplateBinding BorderBrush}"
                     BorderThickness="{TemplateBinding BorderThickness}"
-                    CornerRadius="{DynamicResource ControlCornerRadius}" ClipToBounds="True">
+                    CornerRadius="{TemplateBinding CornerRadius}"
+                    ClipToBounds="True">
               <DockPanel>
                 <Panel x:Name="PART_HeaderBar" Height="4" DockPanel.Dock="Top" />
                 <ContentControl Name="PART_Content" Content="{TemplateBinding Content}" />

src/Avalonia.Themes.Fluent/Controls/NumericUpDown.xaml

@@ -29,12 +29,14 @@
     <Setter Property="MinWidth" Value="{DynamicResource TextControlThemeMinWidth}" />    
     <Setter Property="FontSize" Value="{DynamicResource ControlContentThemeFontSize}" />
     <Setter Property="Padding" Value="{DynamicResource TextControlThemePadding}" />
+    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
     <Setter Property="Template">
       <ControlTemplate>
         <ButtonSpinner Name="PART_Spinner"
                        Background="{TemplateBinding Background}"
                        BorderThickness="{TemplateBinding BorderThickness}"
                        BorderBrush="{TemplateBinding BorderBrush}"
+                       CornerRadius="{TemplateBinding CornerRadius}"
                        Padding="0"
                        HorizontalContentAlignment="Stretch"
                        VerticalContentAlignment="Stretch"

src/Avalonia.Themes.Fluent/Controls/ProgressBar.xaml

@@ -14,12 +14,13 @@
     <Setter Property="Foreground" Value="{DynamicResource SystemControlHighlightAccentBrush}" />
     <Setter Property="Background" Value="{DynamicResource SystemControlBackgroundBaseLowBrush}" />
     <Setter Property="BorderThickness" Value="{DynamicResource ProgressBarBorderThemeThickness}" />
+    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
     <Setter Property="BorderBrush" Value="{DynamicResource SystemControlHighlightTransparentBrush}" />
     <Setter Property="MinHeight" Value="{DynamicResource ProgressBarThemeMinHeight}" />
     <Setter Property="VerticalAlignment" Value="Center" />
     <Setter Property="Template">
       <ControlTemplate>
-        <Border x:Name="ProgressBarRoot" ClipToBounds="True" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="{DynamicResource ControlCornerRadius}">          
+        <Border x:Name="ProgressBarRoot" ClipToBounds="True" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="{TemplateBinding CornerRadius}">          
             <Panel>
               <Panel x:Name="DeterminateRoot">
                 <Border CornerRadius="{DynamicResource ControlCornerRadius}" x:Name="PART_Indicator" Margin="{TemplateBinding Padding}" Background="{TemplateBinding Foreground}" />

src/Avalonia.Themes.Fluent/Controls/RadioButton.xaml

@@ -2,7 +2,7 @@
   <Design.PreviewWith>
     <Border Padding="20">
       <StackPanel Spacing="10">
-        <RadioButton Content="Option 1" />
+        <RadioButton Content="Option 1" Background="Green" />
         <RadioButton Content="Option 2" />
         <RadioButton IsEnabled="False" Content="Option 3" />
         <RadioButton Content="Option 2" />
@@ -13,6 +13,7 @@
     <Setter Property="Background" Value="{DynamicResource RadioButtonBackground}" />
     <Setter Property="Foreground" Value="{DynamicResource RadioButtonForeground}" />
     <Setter Property="BorderBrush" Value="{DynamicResource RadioButtonBorderBrush}" />
+    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
     <Setter Property="Padding" Value="8,0,0,0" />
     <Setter Property="HorizontalAlignment" Value="Left" />
     <Setter Property="VerticalAlignment" Value="Center" />
@@ -24,7 +25,8 @@
         <Border Name="RootBorder"
                 Background="{TemplateBinding Background}"
                 BorderBrush="{TemplateBinding BorderBrush}"
-                BorderThickness="{TemplateBinding BorderThickness}">
+                BorderThickness="{TemplateBinding BorderThickness}"
+                CornerRadius="{TemplateBinding CornerRadius}">
           <Grid ColumnDefinitions="20,*">
             <Grid VerticalAlignment="Top"
               Height="32">
@@ -75,11 +77,6 @@
     <Setter Property="Stroke" Value="{DynamicResource RadioButtonCheckGlyphStroke}" />
     <Setter Property="Fill" Value="{DynamicResource RadioButtonCheckGlyphFill}" />
   </Style>
-  
-  <Style Selector="RadioButton /template/ Border#RootBorder">
-    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
-  </Style>
-
 
   <!-- PointerOver State -->
   <Style Selector="RadioButton:pointerover /template/ ContentPresenter#PART_ContentPresenter">

src/Avalonia.Themes.Fluent/Controls/RepeatButton.xaml

@@ -15,6 +15,7 @@
     <Setter Property="Foreground" Value="{DynamicResource RepeatButtonForeground}" />
     <Setter Property="BorderBrush" Value="{DynamicResource RepeatButtonBorderBrush}" />
     <Setter Property="BorderThickness" Value="{DynamicResource ButtonBorderThemeThickness}" />
+    <Setter Property="CornerRadius" Value="{DynamicResource ControlCornerRadius}" />
     <Setter Property="Padding" Value="{StaticResource ButtonPadding}" />
     <Setter Property="HorizontalAlignment" Value="Left" />
     <Setter Property="VerticalAlignment" Value="Center" />    
@@ -28,6 +29,7 @@
                           Background="{TemplateBinding Background}"
                           BorderBrush="{TemplateBinding BorderBrush}"
                           BorderThickness="{TemplateBinding BorderThickness}"
+                          CornerRadius="{TemplateBinding CornerRadius}"
                           Content="{TemplateBinding Content}"
                           ContentTemplate="{TemplateBinding ContentTemplate}"
                           Padding="{TemplateBinding Padding}"

src/Avalonia.Themes.Fluent/Controls/Separator.xaml

@@ -10,6 +10,7 @@
                 VerticalAlignment="{TemplateBinding VerticalAlignment}"
                 BorderBrush="{TemplateBinding BorderBrush}"
                 BorderThickness="{TemplateBinding BorderThickness}"
+                CornerRadius="{TemplateBinding CornerRadius}"
                 Background="{TemplateBinding Background}"/>
       </ControlTemplate>
     </Setter>

src/Avalonia.Themes.Fluent/Controls/Slider.xaml

@@ -43,7 +43,7 @@
     <Setter Property="Template">
       <ControlTemplate>
         <DataValidationErrors>
-          <Border BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" CornerRadius="{DynamicResource ControlCornerRadius}">
+          <Border BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" CornerRadius="{TemplateBinding CornerRadius}">
             <Grid Name="grid" Margin="{TemplateBinding Padding}" RowDefinitions="Auto, *">
               <ContentPresenter x:Name="HeaderContentPresenter" Grid.Row="0" TextBlock.FontWeight="{DynamicResource SliderHeaderThemeFontWeight}" TextBlock.Foreground="{DynamicResource SliderHeaderForeground}"
               Margin="{DynamicResource SliderTopHeaderMargin}" />
@@ -105,7 +105,7 @@
     <Setter Property="Template">
       <ControlTemplate>
         <DataValidationErrors>
-          <Border BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" CornerRadius="{DynamicResource ControlCornerRadius}">
+          <Border BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" CornerRadius="{TemplateBinding CornerRadius}">
             <Grid Name="grid" Margin="{TemplateBinding Padding}" RowDefinitions="Auto, *">
               <ContentPresenter x:Name="HeaderContentPresenter" Grid.Row="0" TextBlock.FontWeight="{DynamicResource SliderHeaderThemeFontWeight}" TextBlock.Foreground="{DynamicResource SliderHeaderForeground}"
               Margin="{DynamicResource SliderTopHeaderMargin}" />

src/Avalonia.Themes.Fluent/Controls/TabControl.xaml

@@ -29,9 +29,9 @@
     <Setter Property="Background" Value="{DynamicResource TabControlBackground}" />
     <Setter Property="Template">
       <ControlTemplate>
-        <Border Margin="{TemplateBinding Margin}"
+        <Border BorderBrush="{TemplateBinding BorderBrush}"
-                BorderBrush="{TemplateBinding BorderBrush}"
                 BorderThickness="{TemplateBinding BorderThickness}"
+                CornerRadius="{TemplateBinding CornerRadius}"
                 Background="{TemplateBinding Background}"
                 HorizontalAlignment="{TemplateBinding HorizontalAlignment}"
                 VerticalAlignment="{TemplateBinding VerticalAlignment}">

src/Avalonia.Themes.Fluent/Controls/TabItem.xaml

@@ -28,6 +28,7 @@
         <Border Name="PART_LayoutRoot"
                 BorderBrush="{TemplateBinding BorderBrush}"
                 BorderThickness="{TemplateBinding BorderThickness}"
+                CornerRadius="{TemplateBinding CornerRadius}"
                 Padding="{TemplateBinding Padding}">
           <Panel>
             <ContentPresenter Name="PART_ContentPresenter"

src/Avalonia.Themes.Fluent/Controls/TabStrip.xaml

@@ -11,10 +11,16 @@
   <Style Selector="TabStrip">
     <Setter Property="Template">
       <ControlTemplate>
-        <ItemsPresenter Name="PART_ItemsPresenter"
+        <Border Background="{TemplateBinding Background}"
-                        Items="{TemplateBinding Items}"
+                BorderBrush="{TemplateBinding BorderBrush}"
-                        ItemsPanel="{TemplateBinding ItemsPanel}"
+                BorderThickness="{TemplateBinding BorderThickness}"
-                        ItemTemplate="{TemplateBinding ItemTemplate}" />
+                CornerRadius="{TemplateBinding CornerRadius}"
+                Padding="{TemplateBinding Padding}">
+          <ItemsPresenter Name="PART_ItemsPresenter"
+                          Items="{TemplateBinding Items}"
+                          ItemsPanel="{TemplateBinding ItemsPanel}"
+                          ItemTemplate="{TemplateBinding ItemTemplate}" />
+        </Border>
       </ControlTemplate>
     </Setter>
     <Setter Property="ItemsPanel">

src/Avalonia.Themes.Fluent/Controls/TabStripItem.xaml

@@ -27,6 +27,7 @@
         <Border Name="PART_LayoutRoot"
                 BorderBrush="{TemplateBinding BorderBrush}"
                 BorderThickness="{TemplateBinding BorderThickness}"
+                CornerRadius="{TemplateBinding CornerRadius}"
                 Padding="{TemplateBinding Padding}">
           <Panel>
             <ContentPresenter Name="PART_ContentPresenter"