remove debug code.

samples/ControlCatalog/MainWindow.xaml.cs

@@ -29,22 +29,6 @@ namespace ControlCatalog
             };
 
             DataContext = new MainWindowViewModel(_notificationArea);
-
-            Dispatcher.UIThread.Post(() =>
-            {
-                new OpenFileDialog()
-                {
-                    Filters = new List<FileDialogFilter>
-                {
-                    new FileDialogFilter {Name = "All files", Extensions = {"*"}},
-                    new FileDialogFilter {Name = "Image files", Extensions = {"jpg", "png", "gif"}}
-                },
-                    Directory = Environment.GetFolderPath(Environment.SpecialFolder.Desktop),
-                    Title = "My dialog",
-                    InitialFileName = "config.local.json",
-                    AllowMultiple = true
-                }.ShowAsync(this);
-            });
         }
 
         private void InitializeComponent()