diff --git a/packages/Avalonia/AvaloniaBuildTasks.targets b/packages/Avalonia/AvaloniaBuildTasks.targets
index 45a7f1aa44..de3830ffea 100644
--- a/packages/Avalonia/AvaloniaBuildTasks.targets
+++ b/packages/Avalonia/AvaloniaBuildTasks.targets
@@ -42,12 +42,24 @@
   </Target>
   
   <PropertyGroup>
-    <BuildAvaloniaResourcesDependsOn>$(BuildAvaloniaResourcesDependsOn);AddAvaloniaResources;ResolveReferences</BuildAvaloniaResourcesDependsOn>
+    <BuildAvaloniaResourcesDependsOn>$(BuildAvaloniaResourcesDependsOn);AddAvaloniaResources;ResolveReferences;_GenerateAvaloniaResourcesDependencyCache</BuildAvaloniaResourcesDependsOn>
   </PropertyGroup>
   
+  <Target Name="_GenerateAvaloniaResourcesDependencyCache" BeforeTargets="GenerateAvaloniaResources">
+    <ItemGroup>
+      <CustomAdditionalGenerateAvaloniaResourcesInputs Include="$(IntermediateOutputPath)/Avalonia/Resources.Inputs.cache" />
+    </ItemGroup>
+    
+    <Hash ItemsToHash="@(AvaloniaResource);@(AvaloniaXaml);$(MSBuildAllProjects)">
+      <Output TaskParameter="HashResult" PropertyName="AvaloniaResourcesDependencyHash" />
+    </Hash>
+
+    <WriteLinesToFile Overwrite="true" File="$(IntermediateOutputPath)/Avalonia/Resources.Inputs.cache" Lines="$(AvaloniaResourcesDependencyHash)" WriteOnlyWhenDifferent="True" />
+  </Target>
+  
   <Target Name="GenerateAvaloniaResources" 
           BeforeTargets="CoreCompile;CoreResGen"
-          Inputs="@(AvaloniaResource);@(AvaloniaXaml);$(MSBuildAllProjects)"
+          Inputs="@(AvaloniaResource);@(AvaloniaXaml);@(CustomAdditionalGenerateAvaloniaResourcesInputs);$(MSBuildAllProjects)"
           Outputs="$(AvaloniaResourcesTemporaryFilePath)"
 	  DependsOnTargets="$(BuildAvaloniaResourcesDependsOn)">
     <ItemGroup>
diff --git a/src/Avalonia.Controls/Design.cs b/src/Avalonia.Controls/Design.cs
index 0d05e19e53..07d2918a88 100644
--- a/src/Avalonia.Controls/Design.cs
+++ b/src/Avalonia.Controls/Design.cs
@@ -60,6 +60,19 @@ namespace Avalonia.Controls
             return target.GetValue(PreviewWithProperty);
         }
 
+        public static readonly AttachedProperty<IStyle> DesignStyleProperty = AvaloniaProperty
+            .RegisterAttached<Control, IStyle>("DesignStyle", typeof(Design));
+
+        public static void SetDesignStyle(Control control, IStyle value)
+        {
+            control.SetValue(DesignStyleProperty, value);
+        }
+
+        public static IStyle GetDesignStyle(Control control)
+        {
+            return control.GetValue(DesignStyleProperty);
+        }
+
         public static void ApplyDesignModeProperties(Control target, Control source)
         {
             if (source.IsSet(WidthProperty))
@@ -68,6 +81,8 @@ namespace Avalonia.Controls
                 target.Height = source.GetValue(HeightProperty);
             if (source.IsSet(DataContextProperty))
                 target.DataContext = source.GetValue(DataContextProperty);
+            if (source.IsSet(DesignStyleProperty))
+                target.Styles.Add(source.GetValue(DesignStyleProperty));
         }
     }
 }
diff --git a/src/Avalonia.Themes.Fluent/Controls/NotificationCard.xaml b/src/Avalonia.Themes.Fluent/Controls/NotificationCard.xaml
index c06b501f82..924d977eb5 100644
--- a/src/Avalonia.Themes.Fluent/Controls/NotificationCard.xaml
+++ b/src/Avalonia.Themes.Fluent/Controls/NotificationCard.xaml
@@ -17,7 +17,7 @@
     <Setter Property="Template">
       <ControlTemplate>
         <LayoutTransformControl Name="PART_LayoutTransformControl" UseRenderTransform="True">
-          <Border CornerRadius="{DynamicResource ControlCornerRadius}" BoxShadow="0 6 8 0 #4F000000" Margin="5 5 5 10">
+          <Border CornerRadius="{TemplateBinding CornerRadius}" BoxShadow="0 6 8 0 #4F000000" Margin="5 5 5 10">
             <Border Background="{TemplateBinding Background}"
                     BorderBrush="{TemplateBinding BorderBrush}"
                     BorderThickness="{TemplateBinding BorderThickness}"
diff --git a/src/Avalonia.Themes.Fluent/Controls/ProgressBar.xaml b/src/Avalonia.Themes.Fluent/Controls/ProgressBar.xaml
index bd5c4d4691..7ad75588e1 100644
--- a/src/Avalonia.Themes.Fluent/Controls/ProgressBar.xaml
+++ b/src/Avalonia.Themes.Fluent/Controls/ProgressBar.xaml
@@ -23,11 +23,11 @@
         <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}" />
+                <Border CornerRadius="{TemplateBinding CornerRadius}" x:Name="PART_Indicator" Margin="{TemplateBinding Padding}" Background="{TemplateBinding Foreground}" />
               </Panel>
               <Panel x:Name="IndeterminateRoot">
-                <Border x:Name="IndeterminateProgressBarIndicator" CornerRadius="{DynamicResource ControlCornerRadius}" Margin="{TemplateBinding Padding}" Background="{TemplateBinding Foreground}" />
-                <Border x:Name="IndeterminateProgressBarIndicator2" CornerRadius="{DynamicResource ControlCornerRadius}" Margin="{TemplateBinding Padding}" Background="{TemplateBinding Foreground}" />
+                <Border x:Name="IndeterminateProgressBarIndicator" CornerRadius="{TemplateBinding CornerRadius}" Margin="{TemplateBinding Padding}" Background="{TemplateBinding Foreground}" />
+                <Border x:Name="IndeterminateProgressBarIndicator2" CornerRadius="{TemplateBinding CornerRadius}" Margin="{TemplateBinding Padding}" Background="{TemplateBinding Foreground}" />
               </Panel>
             </Panel>          
         </Border>
diff --git a/src/Avalonia.Visuals/Rendering/DeferredRenderer.cs b/src/Avalonia.Visuals/Rendering/DeferredRenderer.cs
index 3bd8e05ee2..6c84cfd55c 100644
--- a/src/Avalonia.Visuals/Rendering/DeferredRenderer.cs
+++ b/src/Avalonia.Visuals/Rendering/DeferredRenderer.cs
@@ -35,6 +35,8 @@ namespace Avalonia.Rendering
         private IRef<IDrawOperation> _currentDraw;
         private readonly IDeferredRendererLock _lock;
         private readonly object _sceneLock = new object();
+        private readonly object _startStopLock = new object();
+        private readonly object _renderLoopIsRenderingLock = new object();
         private readonly Action _updateSceneIfNeededDelegate;
 
         /// <summary>
@@ -139,6 +141,8 @@ namespace Avalonia.Rendering
             }
 
             Stop();
+            // Wait for any in-progress rendering to complete
+            lock(_renderLoopIsRenderingLock){}
             DisposeRenderTarget();
         }
 
@@ -233,20 +237,26 @@ namespace Avalonia.Rendering
         /// <inheritdoc/>
         public void Start()
         {
-            if (!_running && _renderLoop != null)
+            lock (_startStopLock)
             {
-                _renderLoop.Add(this);
-                _running = true;
+                if (!_running && _renderLoop != null)
+                {
+                    _renderLoop.Add(this);
+                    _running = true;
+                }
             }
         }
 
         /// <inheritdoc/>
         public void Stop()
         {
-            if (_running && _renderLoop != null)
+            lock (_startStopLock)
             {
-                _renderLoop.Remove(this);
-                _running = false;
+                if (_running && _renderLoop != null)
+                {
+                    _renderLoop.Remove(this);
+                    _running = false;
+                }
             }
         }
 
@@ -255,7 +265,16 @@ namespace Avalonia.Rendering
 
         void IRenderLoopTask.Update(TimeSpan time) => UpdateScene();
 
-        void IRenderLoopTask.Render() => Render(false);
+        void IRenderLoopTask.Render()
+        {
+            lock (_renderLoopIsRenderingLock)
+            {
+                lock(_startStopLock)
+                    if(!_running)
+                        return;
+                Render(false);
+            }
+        }
 
         /// <inheritdoc/>
         Size IVisualBrushRenderer.GetRenderTargetSize(IVisualBrush brush)
diff --git a/src/Avalonia.X11/X11Window.cs b/src/Avalonia.X11/X11Window.cs
index 149d7fb9b2..f0d2d5ca8a 100644
--- a/src/Avalonia.X11/X11Window.cs
+++ b/src/Avalonia.X11/X11Window.cs
@@ -805,13 +805,14 @@ namespace Avalonia.X11
             
             if (_handle != IntPtr.Zero)
             {
-                XDestroyWindow(_x11.Display, _handle);
                 _platform.Windows.Remove(_handle);
                 _platform.XI2?.OnWindowDestroyed(_handle);
+                var handle = _handle;
                 _handle = IntPtr.Zero;
                 Closed?.Invoke();
                 _mouse.Dispose();
                 _touch.Dispose();
+                XDestroyWindow(_x11.Display, handle);
             }
             
             if (_useRenderWindow && _renderHandle != IntPtr.Zero)