add two way IPC

src/core/Microsoft.PowerToys.Settings.UI.Runner/MainWindow.xaml.cs

@@ -0,0 +1,31 @@
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Windows;
+using Microsoft.PowerToys.Settings.UI.Views;
+using Microsoft.Toolkit.Wpf.UI.XamlHost;
+
+namespace Microsoft.PowerToys.Settings.UI.Runner
+{
+    // Interaction logic for MainWindow.xaml.
+    public partial class MainWindow : Window
+    {
+        public MainWindow()
+        {
+            this.InitializeComponent();
+        }
+
+        private void WindowsXamlHost_ChildChanged(object sender, EventArgs e)
+        {
+            // Hook up x:Bind source.
+            WindowsXamlHost windowsXamlHost = sender as WindowsXamlHost;
+            ShellPage shellPage = windowsXamlHost.GetUwpInternalObject() as ShellPage;
+
+            if (shellPage != null)
+            {
+            }
+        }
+    }
+}