Add implementation

App.xaml.cs

@@ -0,0 +1,23 @@
+using System.Windows;
+
+namespace SystemTemperatureStatusWindow
+{
+    public partial class App
+    {
+        private WindowSource _windowSource;
+
+        protected override void OnStartup(StartupEventArgs e)
+        {
+            base.OnStartup(e);
+
+            _windowSource = new WindowSource();
+        }
+
+        protected override void OnExit(ExitEventArgs e)
+        {
+            _windowSource.Dispose();
+
+            base.OnExit(e);
+        }
+    }
+}