Fix issue：https://gitee.com/WPFDevelopersOrg/WPFDevelopers/issues/ICN2GG 👍

Author: yanjinhuagood

src/WPFDevelopers.Samples.Shared/ExampleViews/MessageExample.xaml.cs

@@ -46,7 +46,7 @@ private void AddButton_Click(object sender, RoutedEventArgs e)
                 case "IntPtr":
                     Window parentWindow = Window.GetWindow(this);
                     IntPtr windowHandle = new WindowInteropHelper(parentWindow).Handle;
-                    Message.Push(windowHandle, "This is a question message", MessageBoxImage.Question);
+                    Message.Push(windowHandle, "This is a Handle message", MessageBoxImage.Question);
                     break;
                 default:
                     Message.Push("这是一条很长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长长消息", MessageBoxImage.Information);