diff --git a/NotificationFlyout.Shared.UI/Helpers/SystemPersonalisationHelper.cs b/NotificationFlyout.Shared.UI/Helpers/SystemPersonalisationHelper.cs
new file mode 100644
index 0000000..a683afe
--- /dev/null
+++ b/NotificationFlyout.Shared.UI/Helpers/SystemPersonalisationHelper.cs
@@ -0,0 +1,35 @@
+using System;
+using Windows.UI.ViewManagement;
+
+namespace NotificationFlyout.Shared.UI.Helpers
+{
+    public class SystemPersonalisationHelper
+    {
+        private readonly UISettings _settings = new UISettings();
+
+        private SystemPersonalisationHelper()
+        {
+            _settings.ColorValuesChanged += _settings_ColorValuesChanged;
+        }
+
+        private void _settings_ColorValuesChanged(UISettings sender, object args)
+        {
+            ThemeChanged?.Invoke(this, EventArgs.Empty);
+        }
+
+        public event EventHandler ThemeChanged;
+
+        public SystemTheme SystemTheme => GetSystemTheme();
+
+        public static SystemPersonalisationHelper Create()
+        {
+            return new SystemPersonalisationHelper();
+        }
+
+        private SystemTheme GetSystemTheme()
+        {
+            var uiTheme = _settings.GetColorValue(UIColorType.Background).ToString();
+            return uiTheme == "#FFFFFFFF" ? SystemTheme.Light : SystemTheme.Dark;
+        }
+    }
+}
diff --git a/NotificationFlyout.Shared.UI/Helpers/SystemTheme.cs b/NotificationFlyout.Shared.UI/Helpers/SystemTheme.cs
new file mode 100644
index 0000000..ee90015
--- /dev/null
+++ b/NotificationFlyout.Shared.UI/Helpers/SystemTheme.cs
@@ -0,0 +1,8 @@
+namespace NotificationFlyout.Shared.UI.Helpers
+{
+    public enum SystemTheme
+    {
+        Dark,
+        Light,
+    }
+}
diff --git a/NotificationFlyout.Shared.UI/NotificationFlyout.Shared.UI.csproj b/NotificationFlyout.Shared.UI/NotificationFlyout.Shared.UI.csproj
new file mode 100644
index 0000000..92145d4
--- /dev/null
+++ b/NotificationFlyout.Shared.UI/NotificationFlyout.Shared.UI.csproj
@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Windows.SDK.Contracts" Version="10.0.19041.1" />
+  </ItemGroup>
+
+</Project>
diff --git a/NotificationFlyout.Tray/Assets/Icon-Light.ico b/NotificationFlyout.Tray/Assets/Icon-Light.ico
new file mode 100644
index 0000000..5c7e7a8
Binary files /dev/null and b/NotificationFlyout.Tray/Assets/Icon-Light.ico differ
diff --git a/NotificationFlyout.Tray/NotificationFlyout.Sample.Wpf.csproj b/NotificationFlyout.Tray/NotificationFlyout.Sample.Wpf.csproj
index 16b2061..b7af113 100644
--- a/NotificationFlyout.Tray/NotificationFlyout.Sample.Wpf.csproj
+++ b/NotificationFlyout.Tray/NotificationFlyout.Sample.Wpf.csproj
@@ -12,6 +12,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <None Remove="Assets\Icon-Light.ico" />
     <None Remove="Assets\Icon.ico" />
   </ItemGroup>
 
@@ -27,6 +28,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <Resource Include="Assets\Icon-Light.ico" />
     <Resource Include="Assets\Icon.ico" />
   </ItemGroup>
   
diff --git a/NotificationFlyout.Tray/SampleNotificationFlyout.xaml b/NotificationFlyout.Tray/SampleNotificationFlyout.xaml
index 0b4c2e5..947fc42 100644
--- a/NotificationFlyout.Tray/SampleNotificationFlyout.xaml
+++ b/NotificationFlyout.Tray/SampleNotificationFlyout.xaml
@@ -4,6 +4,6 @@
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:sample="clr-namespace:NotificationFlyout.Sample;assembly=NotificationFlyout.Sample"
     IconSource="/Assets/Icon.ico"
-    LightIconSource="/Assets/Icon.ico">
+    LightIconSource="/Assets/Icon-Light.ico">
     <sample:NotificationFlyoutPresenter />
 </NotificationFlyout>
diff --git a/NotificationFlyout.Wpf.UI.Controls/NotificationFlyout/NotificationFlyout.cs b/NotificationFlyout.Wpf.UI.Controls/NotificationFlyout/NotificationFlyout.cs
index 1c08447..fe991bc 100644
--- a/NotificationFlyout.Wpf.UI.Controls/NotificationFlyout/NotificationFlyout.cs
+++ b/NotificationFlyout.Wpf.UI.Controls/NotificationFlyout/NotificationFlyout.cs
@@ -1,6 +1,4 @@
 using NotificationFlyout.Uwp.UI.Controls;
-using NotificationFlyout.Wpf.UI.Extensions;
-using NotificationFlyout.Wpf.UI.Helpers;
 using System.Windows;
 using System.Windows.Markup;
 using System.Windows.Media;
@@ -25,8 +23,6 @@ namespace NotificationFlyout.Wpf.UI.Controls
                  typeof(NotificationFlyoutPresenter), typeof(NotificationFlyout),
                  new PropertyMetadata(null, OnFlyoutPresenterPropertyChanged));
 
-        private const string ShellTrayHandleName = "Shell_TrayWnd";
-
         private readonly NotificationFlyoutXamlHost _xamlHost;
 
         public NotificationFlyout()
@@ -82,21 +78,7 @@ namespace NotificationFlyout.Wpf.UI.Controls
 
         private void OnIconPropertyChanged()
         {
-            SetIcon();
-        }
-
-        private void SetIcon()
-        {
-            var shellTrayHandle = WindowHelper.GetHandle(ShellTrayHandleName);
-            if (shellTrayHandle == null) return;
-
-            var dpi = WindowHelper.GetDpi(shellTrayHandle);
-
-            var iconSource = SystemSettingsHelper.DefaultSystemTheme == SystemTheme.Dark ? IconSource : LightIconSource;
-            if (iconSource == null) return;
-
-            using var icon = iconSource.ConvertToIcon(dpi);
-            _xamlHost.SetNotificationIcon(icon.Handle);
+            _xamlHost.SetIcons(IconSource, LightIconSource);
         }
     }
 }
\ No newline at end of file
diff --git a/NotificationFlyout.Wpf.UI.Controls/NotificationFlyout/NotificationFlyoutXamlHost.cs b/NotificationFlyout.Wpf.UI.Controls/NotificationFlyout/NotificationFlyoutXamlHost.cs
index 6740adf..493d610 100644
--- a/NotificationFlyout.Wpf.UI.Controls/NotificationFlyout/NotificationFlyoutXamlHost.cs
+++ b/NotificationFlyout.Wpf.UI.Controls/NotificationFlyout/NotificationFlyoutXamlHost.cs
@@ -11,10 +11,16 @@ namespace NotificationFlyout.Wpf.UI.Controls
 {
     internal class NotificationFlyoutXamlHost : Window
     {
-        private const double MaximumOffset = 80;
+        private const string ShellTrayHandleName = "Shell_TrayWnd";
+        private const double WindowSize = 5;
+
+        private ImageSource _defaultIconSource;
+        private ImageSource _lightIconSource;
         private NotificationIconHelper _notificationIconHelper;
+        private SystemPersonalisationHelper _systemPersonalisationHelper;
         private TaskbarHelper _taskbarHelper;
         private WindowsXamlHost _xamlHost;
+        private bool _isLoaded;
 
         public NotificationFlyoutXamlHost()
         {
@@ -42,9 +48,12 @@ namespace NotificationFlyout.Wpf.UI.Controls
             }
         }
 
-        internal void SetNotificationIcon(IntPtr handle)
+        internal void SetIcons(ImageSource defaultIconSource, ImageSource lightIconSource)
         {
-            _notificationIconHelper.SetIcon(handle);
+            _defaultIconSource = defaultIconSource;
+            _lightIconSource = lightIconSource;
+
+            UpdateIcon();
         }
 
         internal void ShowFlyout()
@@ -83,7 +92,16 @@ namespace NotificationFlyout.Wpf.UI.Controls
             PrepareNotificationIcon();
             PrepareTaskbar();
 
+            _isLoaded = true;
+
             UpdateWindow();
+            UpdateIcon();
+
+        }
+
+        private void OnSystemThemeChanged(object sender, EventArgs args)
+        {
+            UpdateIcon();
         }
 
         private void OnTaskbarChanged(object sender, EventArgs args)
@@ -99,14 +117,17 @@ namespace NotificationFlyout.Wpf.UI.Controls
             ResizeMode = ResizeMode.NoResize;
             AllowsTransparency = true;
             Background = new SolidColorBrush(Colors.Transparent);
-            Height = 5;
-            Width = 5;
+            Height = WindowSize;
+            Width = WindowSize;
         }
 
         private void PrepareNotificationIcon()
         {
             _notificationIconHelper = NotificationIconHelper.Create(this);
             _notificationIconHelper.IconInvoked += OnIconInvoked;
+
+            _systemPersonalisationHelper = SystemPersonalisationHelper.Create(this);
+            _systemPersonalisationHelper.ThemeChanged += OnSystemThemeChanged;
         }
 
         private void PrepareTaskbar()
@@ -128,8 +149,26 @@ namespace NotificationFlyout.Wpf.UI.Controls
             Content = _xamlHost;
         }
 
+        private void UpdateIcon()
+        {
+            if (!_isLoaded) return;
+
+            var shellTrayHandle = WindowHelper.GetHandle(ShellTrayHandleName);
+            if (shellTrayHandle == null) return;
+
+            var dpi = WindowHelper.GetDpi(shellTrayHandle);
+
+            var iconSource = _systemPersonalisationHelper.SystemTheme == SystemTheme.Dark ? _defaultIconSource : _lightIconSource;
+            if (iconSource == null) return;
+
+            using var icon = iconSource.ConvertToIcon(dpi);
+            _notificationIconHelper.SetIcon(icon.Handle);
+        }
+
         private void UpdateWindow()
         {
+            if (!_isLoaded) return;
+
             var flyoutHost = GetFlyoutHost();
             if (flyoutHost == null) return;
 
@@ -138,8 +177,8 @@ namespace NotificationFlyout.Wpf.UI.Controls
             Left = taskbarState.Screen.WorkingArea.Left;
             Top = taskbarState.Screen.WorkingArea.Top;
 
-            var windowWidth = 5 * this.DpiX();
-            var windowHeight = 5 * this.DpiY();
+            var windowWidth = WindowSize * this.DpiX();
+            var windowHeight = WindowSize * this.DpiY();
 
             double top, left, height, width;
        
diff --git a/NotificationFlyout.Wpf.UI/Helpers/NotificationIconHelper.cs b/NotificationFlyout.Wpf.UI/Helpers/NotificationIconHelper.cs
index 0bce1fd..c5597f3 100644
--- a/NotificationFlyout.Wpf.UI/Helpers/NotificationIconHelper.cs
+++ b/NotificationFlyout.Wpf.UI/Helpers/NotificationIconHelper.cs
@@ -12,9 +12,6 @@ namespace NotificationFlyout.Wpf.UI.Helpers
         private const int CallbackMessage = 0x400;
         private const uint IconVersion = 0x4;
 
-        private const int WM_LBUTTONUP = 0x0202;
-        private const int WM_MBUTTONUP = 0x0208;
-        private const int WM_RBUTTONUP = 0x0205;
         private readonly object _lock = new();
         private readonly IntPtr _windowHandle;
         private bool _isDisposed;
@@ -134,36 +131,29 @@ namespace NotificationFlyout.Wpf.UI.Helpers
             }
         }
 
+        private void InvokeIconInvoked(MouseButton mouseButton)
+        {
+            IconInvoked?.Invoke(this, new NotificationIconInvokedEventArgs { MouseButton = mouseButton });
+        }
+
         private void RemoveNotificationIcon() => WriteNotifyIconData(NotifyIconCommand.Delete, NotifyIconDataMember.Message);
+
         private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
         {
             if (msg == CallbackMessage)
             {
-                var mouseButton = MouseButton.Left;
-                var isInvoked = false;
-
                 switch ((uint)lParam)
                 {
-                    case WM_LBUTTONUP:
-                        isInvoked = true;
-                        mouseButton = MouseButton.Left;
+                    case (uint)WndProcMessages.WM_LBUTTONUP:
+                        InvokeIconInvoked(MouseButton.Left);
                         break;
-
-                    case WM_MBUTTONUP:
-                        isInvoked = true;
-                        mouseButton = MouseButton.Middle;
+                    case (uint)WndProcMessages.WM_MBUTTONUP:
+                        InvokeIconInvoked(MouseButton.Middle);
                         break;
-
-                    case WM_RBUTTONUP:
-                        isInvoked = true;
-                        mouseButton = MouseButton.Right;
+                    case (uint)WndProcMessages.WM_RBUTTONUP:
+                        InvokeIconInvoked(MouseButton.Right);
                         break;
                 }
-
-                if (isInvoked)
-                {
-                    IconInvoked?.Invoke(this, new NotificationIconInvokedEventArgs { MouseButton = mouseButton });
-                }
             }
 
             return DefWindowProcW(hwnd, (uint)msg, wParam, (lParam));
diff --git a/NotificationFlyout.Wpf.UI/Helpers/RegistryHelper.cs b/NotificationFlyout.Wpf.UI/Helpers/RegistryHelper.cs
deleted file mode 100644
index d5ad730..0000000
--- a/NotificationFlyout.Wpf.UI/Helpers/RegistryHelper.cs
+++ /dev/null
@@ -1,15 +0,0 @@
-using Microsoft.Win32;
-
-namespace NotificationFlyout.Wpf.UI.Helpers
-{
-    internal static class RegistryHelper
-    {
-        public static TValue GetDwordValue<TValue>(string key, string valueName)
-        {
-            using var baseKey = RegistryKey.OpenBaseKey(RegistryHive.CurrentUser, RegistryView.Registry64);
-            using var subKey = baseKey.OpenSubKey(key);
-
-            return (TValue)subKey.GetValue(valueName, 0);
-        }
-    }
-}
diff --git a/NotificationFlyout.Wpf.UI/Helpers/SystemInformationHelper.cs b/NotificationFlyout.Wpf.UI/Helpers/SystemInformationHelper.cs
index e8adbde..cde40e5 100644
--- a/NotificationFlyout.Wpf.UI/Helpers/SystemInformationHelper.cs
+++ b/NotificationFlyout.Wpf.UI/Helpers/SystemInformationHelper.cs
@@ -8,13 +8,10 @@ namespace NotificationFlyout.Wpf.UI.Helpers
     public static class SystemInformationHelper
     {
         private const int SM_CXSCREEN = 0;
-
         private const int SM_CYSCREEN = 1;
-
         private const int SPI_GETWORKAREA = 48;
 
         public static Rect VirtualScreen => GetVirtualScreen();
-
         public static Rect WorkingArea => GetWorkingArea();
 
         public static int GetCurrentDpi()
diff --git a/NotificationFlyout.Wpf.UI/Helpers/SystemPersonalisationHelper.cs b/NotificationFlyout.Wpf.UI/Helpers/SystemPersonalisationHelper.cs
new file mode 100644
index 0000000..fa7cdb3
--- /dev/null
+++ b/NotificationFlyout.Wpf.UI/Helpers/SystemPersonalisationHelper.cs
@@ -0,0 +1,69 @@
+using NotificationFlyout.Wpf.UI.Extensions;
+using System;
+using System.Runtime.InteropServices;
+using System.Windows;
+using System.Windows.Interop;
+using Windows.UI.ViewManagement;
+
+namespace NotificationFlyout.Wpf.UI.Helpers
+{
+    public class SystemPersonalisationHelper
+    {
+        private readonly UISettings _settings = new();
+
+        private SystemTheme _currentTheme;
+
+
+        private SystemPersonalisationHelper(Window window)
+        {
+            var source = HwndSource.FromHwnd(window.GetHandle());
+            source.AddHook(new HwndSourceHook(WndProc));
+
+            _settings.ColorValuesChanged += OnColorValuesChanged;
+            _currentTheme = GetSystemTheme();
+        }
+
+        public event EventHandler<ThemeChangedEventArgs> ThemeChanged;
+
+        public SystemTheme SystemTheme => GetSystemTheme();
+
+        public static SystemPersonalisationHelper Create(Window window)
+        {
+            return new SystemPersonalisationHelper(window);
+        }
+
+        [DllImport("user32.dll", SetLastError = true)]
+        private static extern IntPtr DefWindowProcW(IntPtr handle, uint msg, IntPtr wParam, IntPtr lParam);
+
+        private SystemTheme GetSystemTheme()
+        {
+            var uiTheme = _settings.GetColorValue(UIColorType.Background).ToString();
+            return uiTheme == "#FFFFFFFF" ? SystemTheme.Light : SystemTheme.Dark;
+        }
+
+        private void OnColorValuesChanged(UISettings sender, object args)
+        {
+            RaiseThemeChangedEvent();
+        }
+
+        private void RaiseThemeChangedEvent()
+        {
+            var theme = GetSystemTheme();
+            if (theme != _currentTheme)
+            {
+                ThemeChanged?.Invoke(this, new ThemeChangedEventArgs(theme));
+                _currentTheme = theme;
+            }
+        }
+
+        private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
+        {
+            if (msg == (int)WndProcMessages.WM_SETTINGCHANGE)
+            {
+                RaiseThemeChangedEvent();
+            }
+
+            return DefWindowProcW(hwnd, (uint)msg, wParam, (lParam));
+        }
+    }
+}
diff --git a/NotificationFlyout.Wpf.UI/Helpers/SystemSettingsHelper.cs b/NotificationFlyout.Wpf.UI/Helpers/SystemSettingsHelper.cs
deleted file mode 100644
index b0d4d37..0000000
--- a/NotificationFlyout.Wpf.UI/Helpers/SystemSettingsHelper.cs
+++ /dev/null
@@ -1,21 +0,0 @@
-using NotificationFlyout.Wpf.UI.Extensions;
-using System;
-
-namespace NotificationFlyout.Wpf.UI.Helpers
-{
-    public static class SystemSettingsHelper
-    {
-       public static SystemTheme DefaultSystemTheme => GetDefaultSystemTheme();
-
-        private static SystemTheme GetDefaultSystemTheme()
-        {
-            return Environment.OSVersion.IsGreaterThan(OperatingSystemVersion.Windows10_1809) && DoesSystemUsesLightTheme() ? SystemTheme.Light : SystemTheme.Dark;
-        }
-
-        private static bool DoesSystemUsesLightTheme()
-        {
-            var personalizeKey = @"Software\Microsoft\Windows\CurrentVersion\Themes\Personalize";
-            return RegistryHelper.GetDwordValue<int>(personalizeKey, "SystemUsesLightTheme") > 0;
-        }
-    }
-}
diff --git a/NotificationFlyout.Wpf.UI/Helpers/TaskbarHelper.cs b/NotificationFlyout.Wpf.UI/Helpers/TaskbarHelper.cs
index 6808b48..859bceb 100644
--- a/NotificationFlyout.Wpf.UI/Helpers/TaskbarHelper.cs
+++ b/NotificationFlyout.Wpf.UI/Helpers/TaskbarHelper.cs
@@ -10,12 +10,9 @@ namespace NotificationFlyout.Wpf.UI.Helpers
     public class TaskbarHelper
     {
         private const string ShellTrayHandleName = "Shell_TrayWnd";
-
         private const int SPI_SETWORKAREA = 0x002F;
 
-        private const int WSETTINGCHANGE = 0x001A;
-
-        private static readonly uint WTASKBARCREATED = PInvoke.RegisterWindowMessage("TaskbarCreated");
+        private readonly uint WM_TASKBARCREATED = PInvoke.RegisterWindowMessage("TaskbarCreated");
 
         private TaskbarHelper(Window window)
         {
@@ -99,7 +96,7 @@ namespace NotificationFlyout.Wpf.UI.Helpers
 
         private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled)
         {
-            if (msg == WTASKBARCREATED || msg == WSETTINGCHANGE && (int)wParam == SPI_SETWORKAREA)
+            if (msg == WM_TASKBARCREATED || msg == (int)WndProcMessages.WM_SETTINGCHANGE && (int)wParam == SPI_SETWORKAREA)
             {
                 TaskbarChanged?.Invoke(this, EventArgs.Empty);
             }
diff --git a/NotificationFlyout.Wpf.UI/Helpers/ThemeChangedEventArgs.cs b/NotificationFlyout.Wpf.UI/Helpers/ThemeChangedEventArgs.cs
new file mode 100644
index 0000000..6da9c84
--- /dev/null
+++ b/NotificationFlyout.Wpf.UI/Helpers/ThemeChangedEventArgs.cs
@@ -0,0 +1,14 @@
+using System;
+
+namespace NotificationFlyout.Wpf.UI.Helpers
+{
+    public class ThemeChangedEventArgs : EventArgs
+    {
+        internal ThemeChangedEventArgs(SystemTheme theme)
+        {
+            Theme = theme;
+        }
+
+        public SystemTheme Theme { get; private set; }
+    }
+}
diff --git a/NotificationFlyout.Wpf.UI/Helpers/WndProcMessages.cs b/NotificationFlyout.Wpf.UI/Helpers/WndProcMessages.cs
new file mode 100644
index 0000000..e6a2cb2
--- /dev/null
+++ b/NotificationFlyout.Wpf.UI/Helpers/WndProcMessages.cs
@@ -0,0 +1,11 @@
+namespace NotificationFlyout.Wpf.UI.Helpers
+{
+    internal enum WndProcMessages
+    {
+        WM_LBUTTONUP = 0x0202,
+        WM_MBUTTONUP = 0x0208,
+        WM_RBUTTONUP = 0x0205,
+        WM_MOUSEMOVE = 0x0200,
+        WM_SETTINGCHANGE = 0x001A,
+    }
+}
\ No newline at end of file
diff --git a/NotificationFlyout.Wpf.UI/NotificationFlyout.Wpf.UI.csproj b/NotificationFlyout.Wpf.UI/NotificationFlyout.Wpf.UI.csproj
index 0da0fef..4909a30 100644
--- a/NotificationFlyout.Wpf.UI/NotificationFlyout.Wpf.UI.csproj
+++ b/NotificationFlyout.Wpf.UI/NotificationFlyout.Wpf.UI.csproj
@@ -11,6 +11,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
+    <PackageReference Include="Microsoft.Windows.SDK.Contracts" Version="10.0.19041.1" />
     <PackageReference Include="System.Drawing.Common" Version="5.0.0" />
   </ItemGroup>