installed prism

App.xaml.cs

@@ -1,9 +1,22 @@
-namespace ModernWpfPlayground
+using System.Windows;
+using Prism.Ioc;
+
+namespace ModernWpfPlayground
 {
     /// <summary>
     /// Interaction logic for App.xaml
     /// </summary>
     public partial class App
     {
+        protected override void RegisterTypes(IContainerRegistry containerRegistry)
+        {
+            containerRegistry.Register<MainWindow>();
+            containerRegistry.Register<WindowViewModel>();
+        }
+
+        protected override Window CreateShell()
+        {
+            return Container.Resolve<MainWindow>();
+        }
     }
 }