Fixed some major issues where it wasn't possible to switch the app accent based on the current system accent.

NotificationFlyout.Sample.Uwp/NotificationFlyoutPresenter.xaml

@@ -1,4 +1,4 @@
-<controls:NotificationFlyoutPresenter
+<UserControl
     x:Class="NotificationFlyout.Sample.Uwp.NotificationFlyoutPresenter"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
@@ -21,4 +21,4 @@
         <ToggleButton Margin="0,0,0,8" />
         <CalendarView Margin="0,0,0,8" />
     </StackPanel>
-</controls:NotificationFlyoutPresenter>
+</UserControl>

NotificationFlyout.Uwp.UI.Controls/NotificationFlyoutHost/NotificationFlyoutHost.cs

@@ -8,9 +8,9 @@ namespace NotificationFlyout.Uwp.UI.Controls
 {
     public class NotificationFlyoutHost : Control
     {
-        public static readonly DependencyProperty FlyoutPresenterProperty =
+        public static readonly DependencyProperty ContentProperty =
-            DependencyProperty.Register(nameof(FlyoutPresenter),
+            DependencyProperty.Register(nameof(Content),
-                typeof(NotificationFlyoutPresenter), typeof(NotificationFlyoutHost),
+                typeof(UIElement), typeof(NotificationFlyoutHost),
                 new PropertyMetadata(null));
 
         private bool _isLoaded;
@@ -22,10 +22,10 @@ namespace NotificationFlyout.Uwp.UI.Controls
             DefaultStyleKey = typeof(NotificationFlyoutHost);
         }
 
-        public NotificationFlyoutPresenter FlyoutPresenter
+        public UIElement Content
         {
-            get => (NotificationFlyoutPresenter)GetValue(FlyoutPresenterProperty);
+            get => (UIElement)GetValue(ContentProperty);
-            set => SetValue(FlyoutPresenterProperty, value);
+            set => SetValue(ContentProperty, value);
         }
 
         public void HideFlyout()
@@ -59,7 +59,6 @@ namespace NotificationFlyout.Uwp.UI.Controls
         protected override void OnApplyTemplate()
         {
             _root = GetTemplateChild("Root") as Grid;
-
             if (GetTemplateChild("ContentRoot") is Grid contentRoot)
             {
                 contentRoot.Shadow = new ThemeShadow();

NotificationFlyout.Uwp.UI.Controls/NotificationFlyoutHost/NotificationFlyoutHost.xaml

@@ -54,7 +54,7 @@
                                                 FromVerticalOffset="0" />
                                         </TransitionCollection>
                                     </Grid.Transitions>
-                                    <ContentControl Content="{TemplateBinding FlyoutPresenter}" />
+                                    <controls:NotificationFlyoutContentPresenter Content="{TemplateBinding Content}" />
                                 </Grid>
                             </Flyout>
                         </FlyoutBase.AttachedFlyout>

NotificationFlyout.Uwp.UI.Controls/NotificationFlyoutPresenter/NotificationFlyoutPresenter.cs

@@ -1,71 +1,12 @@
-using System.Linq;
+using Windows.UI.Xaml.Controls;
-using Windows.UI.Popups;
-using Windows.UI.Xaml;
-using Windows.UI.Xaml.Controls;
 
 namespace NotificationFlyout.Uwp.UI.Controls
 {
     public class NotificationFlyoutPresenter : ContentControl
     {
-        private NotificationFlyoutContentPresenter _contentPresenter;
-
-        private bool _isColorPrevalence;
-        private ElementTheme _systemTheme;
-
         public NotificationFlyoutPresenter()
         {
             DefaultStyleKey = typeof(NotificationFlyoutPresenter);       
-            RegisterPropertyChangedCallback(RequestedThemeProperty, RequestedThemePropertyChanged);
-        }
-
-        public void UpdateFlyoutTheme(string theme, bool isColorPrevalence)
-        {
-            _isColorPrevalence = isColorPrevalence;
-            switch (theme)
-            {
-                case "Dark":
-                    _systemTheme = ElementTheme.Dark;
-                    break;
-                case "Light":
-                    _systemTheme = ElementTheme.Light;
-                    break;
-            }
-
-            UpdateThemeVisualState();
-        }
-
-        protected override void OnApplyTemplate()
-        {
-            var _contentPresenter = GetTemplateChild("ContentPresenter") as NotificationFlyoutContentPresenter;
-            Loaded += OnLoaded;
-        }
-
-        private void OnLoaded(object sender, RoutedEventArgs args)
-        {
-            UpdateThemeVisualState();
-        }
-
-        private void RequestedThemePropertyChanged(DependencyObject sender, DependencyProperty dependencyProperty)
-        {
-            if (RequestedTheme == ElementTheme.Default)
-            {
-                _contentPresenter.SetValue(RequestedThemeProperty, _systemTheme);
-            }
-            else
-            {
-                _contentPresenter.SetValue(RequestedThemeProperty, RequestedTheme);
-            }
-        }
-
-        private void UpdateThemeVisualState()
-        {
-            if (_contentPresenter == null) return;
-            if (RequestedTheme == ElementTheme.Default)
-            {
-                _contentPresenter.SetValue(RequestedThemeProperty, _systemTheme);
-            }
-
-            VisualStateManager.GoToState(_contentPresenter, _isColorPrevalence ? "ColorPrevalenceTheme" : "DefaultTheme", true);
         }
     }
 }

NotificationFlyout.Uwp.UI.Controls/NotificationFlyoutPresenter/NotificationFlyoutPresenter.xaml

@@ -6,10 +6,8 @@
         <Setter Property="Template">
             <Setter.Value>
                 <ControlTemplate TargetType="controls:NotificationFlyoutPresenter">
-                    <controls:NotificationFlyoutContentPresenter
+                    <ContentPresenter
                         x:Name="ContentPresenter"
-                        Width="200"
-                        Height="200"
                         Content="{TemplateBinding Content}"
                         ContentTemplate="{TemplateBinding ContentTemplate}" />
                 </ControlTemplate>

NotificationFlyout.Wpf.UI.Controls/NotificationFlyout/NotificationFlyout.cs

@@ -5,7 +5,7 @@ using System.Windows.Media;
 
 namespace NotificationFlyout.Wpf.UI.Controls
 {
-    [ContentProperty(nameof(FlyoutPresenter))]
+    [ContentProperty(nameof(Content))]
     public class NotificationFlyout : DependencyObject
     {
         public static readonly DependencyProperty IconSourceProperty =
@@ -18,9 +18,9 @@ namespace NotificationFlyout.Wpf.UI.Controls
               typeof(ImageSource), typeof(NotificationFlyout),
               new PropertyMetadata(null, OnIconPropertyChanged));
 
-        public static DependencyProperty FlyoutPresenterProperty =
+        public static DependencyProperty ContentProperty =
-            DependencyProperty.Register(nameof(FlyoutPresenter),
+            DependencyProperty.Register(nameof(Content),
-                 typeof(NotificationFlyoutPresenter), typeof(NotificationFlyout),
+                 typeof(Windows.UI.Xaml.UIElement), typeof(NotificationFlyout),
                  new PropertyMetadata(null, OnFlyoutPresenterPropertyChanged));
 
         private readonly NotificationFlyoutXamlHost _xamlHost;
@@ -31,10 +31,10 @@ namespace NotificationFlyout.Wpf.UI.Controls
             _xamlHost.Show();
         }
 
-        public NotificationFlyoutPresenter FlyoutPresenter
+        public Windows.UI.Xaml.UIElement Content
         {
-            get => (NotificationFlyoutPresenter)GetValue(FlyoutPresenterProperty);
+            get => (Windows.UI.Xaml.UIElement)GetValue(ContentProperty);
-            set => SetValue(FlyoutPresenterProperty, value);
+            set => SetValue(ContentProperty, value);
         }
 
         public ImageSource IconSource
@@ -73,7 +73,7 @@ namespace NotificationFlyout.Wpf.UI.Controls
 
         private void OnFlyoutPresenterPropertyChanged()
         {
-            _xamlHost.SetFlyoutPresenter(FlyoutPresenter);
+            _xamlHost.SetFlyoutContent(Content);
         }
 
         private void OnIconPropertyChanged()

NotificationFlyout.Wpf.UI.Controls/NotificationFlyout/NotificationFlyoutXamlHost.cs

@@ -30,17 +30,12 @@ namespace NotificationFlyout.Wpf.UI.Controls
             Loaded += OnLoaded;
         }
 
-        public void SetFlyoutPresenter(NotificationFlyoutPresenter flyoutPresenter)
+        public void SetFlyoutContent(Windows.UI.Xaml.UIElement content)
         {
             var flyoutHost = GetFlyoutHost();
             if (flyoutHost != null)
             {
-                flyoutHost.FlyoutPresenter = flyoutPresenter;
+                flyoutHost.Content = content;
-
-                var theme = _systemPersonalisationHelper.Theme.ToString();
-                var isColorPrevalence = _systemPersonalisationHelper.IsColorPrevalence;
-
-                flyoutHost.FlyoutPresenter.UpdateFlyoutTheme(theme, isColorPrevalence);
             }
         }
 
@@ -111,22 +106,9 @@ namespace NotificationFlyout.Wpf.UI.Controls
 
         private void OnThemeChanged(object sender, SystemPersonalisationChangedEventArgs args)
         {
-            NewMethod(args);
             UpdateIcon();
         }
 
-        private void NewMethod(SystemPersonalisationChangedEventArgs args)
-        {
-            var flyoutHost = GetFlyoutHost();
-            if (flyoutHost != null)
-            {
-                var theme = args.Theme.ToString();
-                var isColorPrevalence = args.IsColorPrevalence;
-
-                flyoutHost.FlyoutPresenter.UpdateFlyoutTheme(theme, isColorPrevalence);
-            }
-        }
-
         private void PrepareDefaultWindow()
         {
             ShowInTaskbar = false;