优化更新代码，添加界面功能并整合

WPFluent/Controls/MessageBox/MessageBoxOpenedEventArgs.cs

@@ -0,0 +1,8 @@
+namespace WPFluent.Controls;
+
+public class MessageBoxOpenedEventArgs : RoutedEventArgs
+{
+    internal MessageBoxOpenedEventArgs()
+    {
+    }
+}