diff --git a/MaterialModernWPF/App.xaml.cs b/MaterialModernWPF/App.xaml.cs
index 154b60d..eb4a543 100644
--- a/MaterialModernWPF/App.xaml.cs
+++ b/MaterialModernWPF/App.xaml.cs
@@ -1,9 +1,8 @@
-using System.Collections.Generic;
-using System.Windows;
+using System.Windows;
+using DryIoc;
 using MaterialModernWPF.Module;
 using MaterialModernWPF.Service;
 using MaterialModernWPF.View;
-using Prism.DryIoc;
 using Prism.Ioc;
 using Prism.Modularity;
 
@@ -12,8 +11,15 @@ namespace MaterialModernWPF
     /// <summary>
     ///     Interaktionslogik für "App.xaml"
     /// </summary>
-    public partial class App : PrismApplication
+    public partial class App
     {
+        protected override Rules CreateContainerRules()
+        {
+            return Rules.Default.WithAutoConcreteTypeResolution()
+                .With(Made.Of(FactoryMethod.ConstructorWithResolvableArguments))
+                .WithDefaultIfAlreadyRegistered(IfAlreadyRegistered.AppendNotKeyed);
+        }
+
         protected override void RegisterTypes(IContainerRegistry containerRegistry)
         {
             containerRegistry.Register<ShellViewModel>();
diff --git a/MaterialModernWPF/Service/CalculationPackageContainer.cs b/MaterialModernWPF/Service/CalculationPackageContainer.cs
index c3e55b5..71b871d 100644
--- a/MaterialModernWPF/Service/CalculationPackageContainer.cs
+++ b/MaterialModernWPF/Service/CalculationPackageContainer.cs
@@ -23,7 +23,7 @@ namespace MaterialModernWPF.Service
 
         private void SelectionChanged((CalculationPackage sender, bool isSelected) payload)
         {
-            var viewKey = payload.sender.CalculationViewType.FullName;
+            var viewKey = payload.sender.GetType().FullName;
             var region = _regionManager.Regions[Constants.PackagesRegion];
             if (payload.isSelected)
             {