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diff --git a/src/samples/Dtf/EmbeddedUI/SampleEmbeddedUI.cs b/src/samples/Dtf/EmbeddedUI/SampleEmbeddedUI.cs
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+++ b/src/samples/Dtf/EmbeddedUI/SampleEmbeddedUI.cs
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+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+namespace WixToolset.Dtf.Samples.EmbeddedUI
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Configuration;
+    using System.Threading;
+    using System.Windows;
+    using System.Windows.Threading;
+    using WixToolset.Dtf.WindowsInstaller;
+    using Application = System.Windows.Application;
+
+    public class SampleEmbeddedUI : IEmbeddedUI
+    {
+        private Thread appThread;
+        private Application app;
+        private SetupWizard setupWizard;
+        private ManualResetEvent installStartEvent;
+        private ManualResetEvent installExitEvent;
+
+        /// <summary>
+        /// Initializes the embedded UI.
+        /// </summary>
+        /// <param name="session">Handle to the installer which can be used to get and set properties.
+        /// The handle is only valid for the duration of this method call.</param>
+        /// <param name="resourcePath">Path to the directory that contains all the files from the MsiEmbeddedUI table.</param>
+        /// <param name="internalUILevel">On entry, contains the current UI level for the installation. After this
+        /// method returns, the installer resets the UI level to the returned value of this parameter.</param>
+        /// <returns>True if the embedded UI was successfully initialized; false if the installation
+        /// should continue without the embedded UI.</returns>
+        /// <exception cref="InstallCanceledException">The installation was canceled by the user.</exception>
+        /// <exception cref="InstallerException">The embedded UI failed to initialize and
+        /// causes the installation to fail.</exception>
+        public bool Initialize(Session session, string resourcePath, ref InstallUIOptions internalUILevel)
+        {
+            if (session != null)
+            {
+                if ((internalUILevel & InstallUIOptions.Full) != InstallUIOptions.Full)
+                {
+                    // Don't show custom UI when the UI level is set to basic.
+                    return false;
+
+                    // An embedded UI could display an alternate dialog sequence for reduced or
+                    // basic modes, but it's not implemented here. We'll just fall back to the
+                    // built-in MSI basic UI.
+                }
+
+                if (String.Equals(session["REMOVE"], "All", StringComparison.OrdinalIgnoreCase))
+                {
+                    // Don't show custom UI when uninstalling.
+                    return false;
+
+                    // An embedded UI could display an uninstall wizard, it's just not imlemented here.
+                }
+            }
+
+            // Start the setup wizard on a separate thread.
+            this.installStartEvent = new ManualResetEvent(false);
+            this.installExitEvent = new ManualResetEvent(false);
+            this.appThread = new Thread(this.Run);
+            this.appThread.SetApartmentState(ApartmentState.STA);
+            this.appThread.Start();
+
+            // Wait for the setup wizard to either kickoff the install or prematurely exit.
+            int waitResult = WaitHandle.WaitAny(new WaitHandle[] { this.installStartEvent, this.installExitEvent });
+            if (waitResult == 1)
+            {
+                // The setup wizard set the exit event instead of the start event. Cancel the installation.
+                throw new InstallCanceledException();
+            }
+            else
+            {
+                // Start the installation with a silenced internal UI.
+                // This "embedded external UI" will handle message types except for source resolution.
+                internalUILevel = InstallUIOptions.NoChange | InstallUIOptions.SourceResolutionOnly;
+                return true;
+            }
+        }
+
+        /// <summary>
+        /// Processes information and progress messages sent to the user interface.
+        /// </summary>
+        /// <param name="messageType">Message type.</param>
+        /// <param name="messageRecord">Record that contains message data.</param>
+        /// <param name="buttons">Message box buttons.</param>
+        /// <param name="icon">Message box icon.</param>
+        /// <param name="defaultButton">Message box default button.</param>
+        /// <returns>Result of processing the message.</returns>
+        public MessageResult ProcessMessage(InstallMessage messageType, Record messageRecord,
+            MessageButtons buttons, MessageIcon icon, MessageDefaultButton defaultButton)
+        {
+            // Synchronously send the message to the setup wizard window on its thread.
+            object result = this.setupWizard.Dispatcher.Invoke(DispatcherPriority.Send,
+                new Func<MessageResult>(delegate()
+                {
+                    return this.setupWizard.ProcessMessage(messageType, messageRecord, buttons, icon, defaultButton);
+                }));
+            return (MessageResult) result;
+        }
+
+        /// <summary>
+        /// Shuts down the embedded UI at the end of the installation.
+        /// </summary>
+        /// <remarks>
+        /// If the installation was canceled during initialization, this method will not be called.
+        /// If the installation was canceled or failed at any later point, this method will be called at the end.
+        /// </remarks>
+        public void Shutdown()
+        {
+            // Wait for the user to exit the setup wizard.
+            this.setupWizard.Dispatcher.BeginInvoke(DispatcherPriority.Normal,
+                new Action(delegate()
+                {
+                    this.setupWizard.EnableExit();
+                }));
+            this.appThread.Join();
+        }
+
+        /// <summary>
+        /// Creates the setup wizard and runs the application thread.
+        /// </summary>
+        private void Run()
+        {
+            this.app = new Application();
+            this.setupWizard = new SetupWizard(this.installStartEvent);
+            this.setupWizard.InitializeComponent();
+            this.app.Run(this.setupWizard);
+            this.installExitEvent.Set();
+        }
+    }
+}