Added theme sample for the KB.

SyncfusionThemeSample/SyncfusionThemeSample.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.9.34723.18
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SyncfusionThemeSample", "SyncfusionThemeSample\SyncfusionThemeSample.csproj", "{40261A07-FBB5-441B-B006-24445026C9AB}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{40261A07-FBB5-441B-B006-24445026C9AB}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{40261A07-FBB5-441B-B006-24445026C9AB}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{40261A07-FBB5-441B-B006-24445026C9AB}.Debug|Any CPU.Deploy.0 = Debug|Any CPU
+		{40261A07-FBB5-441B-B006-24445026C9AB}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{40261A07-FBB5-441B-B006-24445026C9AB}.Release|Any CPU.Build.0 = Release|Any CPU
+		{40261A07-FBB5-441B-B006-24445026C9AB}.Release|Any CPU.Deploy.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {4D8E039E-B34C-425F-B1B5-BDC184F94BB5}
+	EndGlobalSection
+EndGlobal

SyncfusionThemeSample/SyncfusionThemeSample/App.xaml

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+<?xml version = "1.0" encoding = "UTF-8" ?>
+<Application xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             xmlns:local="clr-namespace:SyncfusionThemeSample"
+             xmlns:themes="clr-namespace:Syncfusion.Maui.Themes;assembly=Syncfusion.Maui.Core"
+             x:Class="SyncfusionThemeSample.App">
+    <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <ResourceDictionary Source="Resources/Styles/Colors.xaml" />
+                <ResourceDictionary Source="Resources/Styles/Styles.xaml" />
+                <themes:SyncfusionThemeResourceDictionary VisualTheme="MaterialLight"/>
+            </ResourceDictionary.MergedDictionaries>
+        </ResourceDictionary>
+    </Application.Resources>
+</Application>

SyncfusionThemeSample/SyncfusionThemeSample/App.xaml.cs

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+namespace SyncfusionThemeSample
+{
+    public partial class App : Application
+    {
+        public App()
+        {
+            InitializeComponent();
+
+            MainPage = new AppShell();
+        }
+    }
+}

SyncfusionThemeSample/SyncfusionThemeSample/AppShell.xaml

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+<?xml version="1.0" encoding="UTF-8" ?>
+<Shell
+    x:Class="SyncfusionThemeSample.AppShell"
+    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+    xmlns:local="clr-namespace:SyncfusionThemeSample"
+    Shell.FlyoutBehavior="Disabled"
+    Title="SyncfusionThemeSample">
+
+    <ShellContent
+        Title="Home"
+        ContentTemplate="{DataTemplate local:MainPage}"
+        Route="MainPage" />
+
+</Shell>

SyncfusionThemeSample/SyncfusionThemeSample/AppShell.xaml.cs

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+namespace SyncfusionThemeSample
+{
+    public partial class AppShell : Shell
+    {
+        public AppShell()
+        {
+            InitializeComponent();
+        }
+    }
+}

SyncfusionThemeSample/SyncfusionThemeSample/MainPage.xaml

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+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="SyncfusionThemeSample.MainPage"
+             xmlns:buttons="clr-namespace:Syncfusion.Maui.Buttons;assembly=Syncfusion.Maui.Buttons">
+
+    <StackLayout VerticalOptions="CenterAndExpand">
+        <buttons:SfButton Text="Change Theme (Light/ Dark)"
+                          HorizontalOptions="Center"
+                          VerticalOptions="Center"
+                          Clicked="ChangeSyncfusionControlsTheme"/>
+    </StackLayout>
+
+</ContentPage>

SyncfusionThemeSample/SyncfusionThemeSample/MainPage.xaml.cs

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+using Syncfusion.Maui.Themes;
+
+namespace SyncfusionThemeSample
+{
+    public partial class MainPage : ContentPage
+    {
+        public MainPage()
+        {
+            InitializeComponent();
+        }
+        private void ChangeSyncfusionControlsTheme(object sender, EventArgs e)
+        {
+            ICollection<ResourceDictionary> mergedDictionaries = Application.Current.Resources.MergedDictionaries;
+            if (mergedDictionaries != null)
+            {
+                var theme = mergedDictionaries.OfType<SyncfusionThemeResourceDictionary>().FirstOrDefault();
+                if (theme != null)
+                {
+                    if (theme.VisualTheme is SfVisuals.MaterialDark)
+                    {
+                        theme.VisualTheme = SfVisuals.MaterialLight;
+                        Application.Current.UserAppTheme = AppTheme.Light;
+                    }
+                    else
+                    {
+                        theme.VisualTheme = SfVisuals.MaterialDark;
+                        Application.Current.UserAppTheme = AppTheme.Dark;
+                    }
+                }
+            }
+        }
+    }
+
+}

SyncfusionThemeSample/SyncfusionThemeSample/MauiProgram.cs

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+using Syncfusion.Maui.Core.Hosting;
+using Microsoft.Extensions.Logging;
+
+namespace SyncfusionThemeSample
+{
+    public static class MauiProgram
+    {
+        public static MauiApp CreateMauiApp()
+        {
+            var builder = MauiApp.CreateBuilder();
+            builder
+                .UseMauiApp<App>()
+                .ConfigureSyncfusionCore()
+                .ConfigureFonts(fonts =>
+                {
+                    fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
+                    fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
+                });
+
+#if DEBUG
+    		builder.Logging.AddDebug();
+#endif
+
+            return builder.Build();
+        }
+    }
+}

SyncfusionThemeSample/SyncfusionThemeSample/Platforms/Android/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+	<application android:allowBackup="true" android:icon="@mipmap/appicon" android:roundIcon="@mipmap/appicon_round" android:supportsRtl="true"></application>
+	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+	<uses-permission android:name="android.permission.INTERNET" />
+</manifest>

SyncfusionThemeSample/SyncfusionThemeSample/Platforms/Android/MainActivity.cs

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+using Android.App;
+using Android.Content.PM;
+using Android.OS;
+
+namespace SyncfusionThemeSample
+{
+    [Activity(Theme = "@style/Maui.SplashTheme", MainLauncher = true, ConfigurationChanges = ConfigChanges.ScreenSize | ConfigChanges.Orientation | ConfigChanges.UiMode | ConfigChanges.ScreenLayout | ConfigChanges.SmallestScreenSize | ConfigChanges.Density)]
+    public class MainActivity : MauiAppCompatActivity
+    {
+    }
+}

SyncfusionThemeSample/SyncfusionThemeSample/Platforms/Android/MainApplication.cs

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+using Android.App;
+using Android.Runtime;
+
+namespace SyncfusionThemeSample
+{
+    [Application]
+    public class MainApplication : MauiApplication
+    {
+        public MainApplication(IntPtr handle, JniHandleOwnership ownership)
+            : base(handle, ownership)
+        {
+        }
+
+        protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
+    }
+}

SyncfusionThemeSample/SyncfusionThemeSample/Platforms/Android/Resources/values/colors.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#512BD4</color>
+    <color name="colorPrimaryDark">#2B0B98</color>
+    <color name="colorAccent">#2B0B98</color>
+</resources>

SyncfusionThemeSample/SyncfusionThemeSample/Platforms/MacCatalyst/AppDelegate.cs

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+using Foundation;
+
+namespace SyncfusionThemeSample
+{
+    [Register("AppDelegate")]
+    public class AppDelegate : MauiUIApplicationDelegate
+    {
+        protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
+    }
+}

SyncfusionThemeSample/SyncfusionThemeSample/Platforms/MacCatalyst/Entitlements.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+    <!-- See https://aka.ms/maui-publish-app-store#add-entitlements for more information about adding entitlements.-->
+    <dict>
+        <!-- App Sandbox must be enabled to distribute a MacCatalyst app through the Mac App Store. -->
+        <key>com.apple.security.app-sandbox</key>
+        <true/>
+        <!-- When App Sandbox is enabled, this value is required to open outgoing network connections. -->
+        <key>com.apple.security.network.client</key>
+        <true/>
+    </dict>
+</plist>
+

SyncfusionThemeSample/SyncfusionThemeSample/Platforms/MacCatalyst/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+    <!-- The Mac App Store requires you specify if the app uses encryption. -->
+    <!-- Please consult https://developer.apple.com/documentation/bundleresources/information_property_list/itsappusesnonexemptencryption -->
+    <!-- <key>ITSAppUsesNonExemptEncryption</key> -->
+    <!-- Please indicate <true/> or <false/> here. -->
+
+    <!-- Specify the category for your app here. -->
+    <!-- Please consult https://developer.apple.com/documentation/bundleresources/information_property_list/lsapplicationcategorytype -->
+    <!-- <key>LSApplicationCategoryType</key> -->
+    <!-- <string>public.app-category.YOUR-CATEGORY-HERE</string> -->
+	<key>UIDeviceFamily</key>
+	<array>
+		<integer>2</integer>
+	</array>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>arm64</string>
+	</array>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>XSAppIconAssets</key>
+	<string>Assets.xcassets/appicon.appiconset</string>
+</dict>
+</plist>

SyncfusionThemeSample/SyncfusionThemeSample/Platforms/MacCatalyst/Program.cs

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+using ObjCRuntime;
+using UIKit;
+
+namespace SyncfusionThemeSample
+{
+    public class Program
+    {
+        // This is the main entry point of the application.
+        static void Main(string[] args)
+        {
+            // if you want to use a different Application Delegate class from "AppDelegate"
+            // you can specify it here.
+            UIApplication.Main(args, null, typeof(AppDelegate));
+        }
+    }
+}

SyncfusionThemeSample/SyncfusionThemeSample/Platforms/Tizen/Main.cs

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+using Microsoft.Maui;
+using Microsoft.Maui.Hosting;
+using System;
+
+namespace SyncfusionThemeSample
+{
+    internal class Program : MauiApplication
+    {
+        protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
+
+        static void Main(string[] args)
+        {
+            var app = new Program();
+            app.Run(args);
+        }
+    }
+}

SyncfusionThemeSample/SyncfusionThemeSample/Platforms/Tizen/tizen-manifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest package="maui-application-id-placeholder" version="0.0.0" api-version="8" xmlns="http://tizen.org/ns/packages">
+  <profile name="common" />
+  <ui-application appid="maui-application-id-placeholder" exec="SyncfusionThemeSample.dll" multiple="false" nodisplay="false" taskmanage="true" type="dotnet" launch_mode="single">
+    <label>maui-application-title-placeholder</label>
+    <icon>maui-appicon-placeholder</icon>
+    <metadata key="http://tizen.org/metadata/prefer_dotnet_aot" value="true" />
+  </ui-application>
+  <shortcut-list />
+  <privileges>
+    <privilege>http://tizen.org/privilege/internet</privilege>
+  </privileges> 
+  <dependencies />
+  <provides-appdefined-privileges />
+</manifest>

SyncfusionThemeSample/SyncfusionThemeSample/Platforms/Windows/App.xaml

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+<maui:MauiWinUIApplication
+    x:Class="SyncfusionThemeSample.WinUI.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:maui="using:Microsoft.Maui"
+    xmlns:local="using:SyncfusionThemeSample.WinUI">
+
+</maui:MauiWinUIApplication>

SyncfusionThemeSample/SyncfusionThemeSample/Platforms/Windows/App.xaml.cs

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+using Microsoft.UI.Xaml;
+
+// To learn more about WinUI, the WinUI project structure,
+// and more about our project templates, see: http://aka.ms/winui-project-info.
+
+namespace SyncfusionThemeSample.WinUI
+{
+    /// <summary>
+    /// Provides application-specific behavior to supplement the default Application class.
+    /// </summary>
+    public partial class App : MauiWinUIApplication
+    {
+        /// <summary>
+        /// Initializes the singleton application object.  This is the first line of authored code
+        /// executed, and as such is the logical equivalent of main() or WinMain().
+        /// </summary>
+        public App()
+        {
+            this.InitializeComponent();
+        }
+
+        protected override MauiApp CreateMauiApp() => MauiProgram.CreateMauiApp();
+    }
+
+}