Completed the main functions

src/Shared/HandyControl_Shared/Data/Args/KeyboardHookEventArgs.cs

@@ -5,10 +5,13 @@ namespace HandyControl.Data
 {
     internal class KeyboardHookEventArgs : EventArgs
     {
+        public bool IsSystemKey { get; }
+
         public Key Key { get; }
 
-        public KeyboardHookEventArgs(int virtualKey)
+        public KeyboardHookEventArgs(int virtualKey, bool isSystemKey)
         {
+            IsSystemKey = isSystemKey;
             Key = KeyInterop.KeyFromVirtualKey(virtualKey);
         }
     }