diff --git a/MaterialModernWPF/App.xaml.cs b/MaterialModernWPF/App.xaml.cs
index 24f1189..33cd085 100644
--- a/MaterialModernWPF/App.xaml.cs
+++ b/MaterialModernWPF/App.xaml.cs
@@ -25,8 +25,8 @@ namespace MaterialModernWPF
             containerRegistry.Register<ShellViewModel>();
             containerRegistry.Register<Shell>();
             containerRegistry.RegisterSingleton<CalculationPackageContainer>();
-            containerRegistry.RegisterSingleton<CalculationPackage, DetailedGeometryPackage>();
-            containerRegistry.RegisterSingleton<CalculationPackage, AdditionalMoments>();
+            containerRegistry.RegisterSingleton<Package, DetailedGeometryPackage>();
+            containerRegistry.RegisterSingleton<Package, AdditionalMoments>();
             containerRegistry.RegisterForNavigation<DetailedGeometryView>();
         }
 
diff --git a/MaterialModernWPF/Module/MainViewModel.cs b/MaterialModernWPF/Module/MainViewModel.cs
index 73d13fd..2ba255d 100644
--- a/MaterialModernWPF/Module/MainViewModel.cs
+++ b/MaterialModernWPF/Module/MainViewModel.cs
@@ -12,6 +12,6 @@ namespace MaterialModernWPF.Module
             _container = container;
         }
 
-        public IEnumerable<CalculationPackage> Packages => _container.CalculationPackages;
+        public IEnumerable<Package> Packages => _container.CalculationPackages;
     }
 }
\ No newline at end of file
diff --git a/MaterialModernWPF/Service/AdditionalMoments.cs b/MaterialModernWPF/Service/AdditionalMoments.cs
index 99c0710..74c13a6 100644
--- a/MaterialModernWPF/Service/AdditionalMoments.cs
+++ b/MaterialModernWPF/Service/AdditionalMoments.cs
@@ -3,7 +3,7 @@ using Prism.Events;
 
 namespace MaterialModernWPF.Service
 {
-    public class AdditionalMoments : CalculationPackage
+    public class AdditionalMoments : Package
     {
         public AdditionalMoments(IEventAggregator eventAggregator) : base(eventAggregator)
         {
diff --git a/MaterialModernWPF/Service/CalculationPackage.cs b/MaterialModernWPF/Service/CalculationPackage.cs
index a83ed39..08a7419 100644
--- a/MaterialModernWPF/Service/CalculationPackage.cs
+++ b/MaterialModernWPF/Service/CalculationPackage.cs
@@ -4,12 +4,12 @@ using Prism.Events;
 
 namespace MaterialModernWPF.Service
 {
-    public abstract class CalculationPackage
+    public abstract class Package
     {
         private readonly IEventAggregator _eventAggregator;
         private bool _isSelected;
 
-        protected CalculationPackage(IEventAggregator eventAggregator)
+        protected Package(IEventAggregator eventAggregator)
         {
             _eventAggregator = eventAggregator;
         }
diff --git a/MaterialModernWPF/Service/CalculationPackageContainer.cs b/MaterialModernWPF/Service/CalculationPackageContainer.cs
index 71b871d..0be73b4 100644
--- a/MaterialModernWPF/Service/CalculationPackageContainer.cs
+++ b/MaterialModernWPF/Service/CalculationPackageContainer.cs
@@ -9,7 +9,7 @@ namespace MaterialModernWPF.Service
     {
         private readonly IRegionManager _regionManager;
         private readonly IResolver _resolver;
-        public CalculationPackage[] CalculationPackages { get; }
+        public Package[] CalculationPackages { get; }
 
         public CalculationPackageContainer(
             IEventAggregator eventAggregator, IRegionManager regionManager,
@@ -17,11 +17,11 @@ namespace MaterialModernWPF.Service
         {
             _regionManager = regionManager;
             _resolver = resolver;
-            CalculationPackages = resolver.ResolveMany<CalculationPackage>().ToArray();
+            CalculationPackages = resolver.ResolveMany<Package>().ToArray();
             eventAggregator.GetEvent<CalculationPackageSelectionChangedEvent>().Subscribe(SelectionChanged);
         }
 
-        private void SelectionChanged((CalculationPackage sender, bool isSelected) payload)
+        private void SelectionChanged((Package sender, bool isSelected) payload)
         {
             var viewKey = payload.sender.GetType().FullName;
             var region = _regionManager.Regions[Constants.PackagesRegion];
diff --git a/MaterialModernWPF/Service/CalculationPackageSelectionChangedEvent.cs b/MaterialModernWPF/Service/CalculationPackageSelectionChangedEvent.cs
index e7470ff..a215b05 100644
--- a/MaterialModernWPF/Service/CalculationPackageSelectionChangedEvent.cs
+++ b/MaterialModernWPF/Service/CalculationPackageSelectionChangedEvent.cs
@@ -2,7 +2,7 @@
 
 namespace MaterialModernWPF.Service
 {
-    public class CalculationPackageSelectionChangedEvent : PubSubEvent<(CalculationPackage, bool)>
+    public class CalculationPackageSelectionChangedEvent : PubSubEvent<(Package, bool)>
     {
 
     }
diff --git a/MaterialModernWPF/Service/DetailedGeometryPackage.cs b/MaterialModernWPF/Service/DetailedGeometryPackage.cs
index d4f6ef9..627a2fa 100644
--- a/MaterialModernWPF/Service/DetailedGeometryPackage.cs
+++ b/MaterialModernWPF/Service/DetailedGeometryPackage.cs
@@ -3,7 +3,7 @@ using Prism.Events;
 
 namespace MaterialModernWPF.Service
 {
-    public class DetailedGeometryPackage : CalculationPackage
+    public class DetailedGeometryPackage : Package
     {
         public DetailedGeometryPackage(IEventAggregator eventAggregator) : base(eventAggregator)
         {
diff --git a/MaterialModernWPF/View/Shell.xaml b/MaterialModernWPF/View/Shell.xaml
index a416983..add8554 100644
--- a/MaterialModernWPF/View/Shell.xaml
+++ b/MaterialModernWPF/View/Shell.xaml
@@ -13,6 +13,7 @@
     Title="NiftyTool NG"
     Width="920"
     Height="600"
+    d:DataContext="{d:DesignInstance view:ShellViewModel}"
     modern:UIHooks.AutoDpiScale="True"
     prism:ViewModelLocator.AutoWireViewModel="True"
     Background="{DynamicResource MaterialDesignPaper}"
@@ -85,7 +86,10 @@
                                 IsChecked="False"
                                 Style="{StaticResource MaterialDesignHamburgerToggleButton}" />
                             <StackPanel DockPanel.Dock="Right" Orientation="Horizontal">
-                                <Button materialDesign:ShadowAssist.ShadowDepth="Depth0" Style="{StaticResource MaterialDesignFloatingActionButton}">
+                                <Button
+                                    materialDesign:ShadowAssist.ShadowDepth="Depth0"
+                                    Command="{Binding GcCollectCommand}"
+                                    Style="{StaticResource MaterialDesignFloatingActionButton}">
                                     <materialDesign:PackIcon
                                         Width="32"
                                         Height="32"
diff --git a/MaterialModernWPF/View/ShellViewModel.cs b/MaterialModernWPF/View/ShellViewModel.cs
index b13191c..ad3bda9 100644
--- a/MaterialModernWPF/View/ShellViewModel.cs
+++ b/MaterialModernWPF/View/ShellViewModel.cs
@@ -1,4 +1,6 @@
-using Prism.Mvvm;
+using System.Windows.Input;
+using Prism.Commands;
+using Prism.Mvvm;
 
 namespace MaterialModernWPF.View
 {
@@ -6,6 +8,9 @@ namespace MaterialModernWPF.View
     {
         public ShellViewModel()
         {
+            GcCollectCommand = new DelegateCommand(System.GC.Collect);
         }
+
+        public ICommand GcCollectCommand {get; }
     }
 }
\ No newline at end of file