Another for #198 because I suck

Artemis/Artemis/Dialogs/MarkdownDialog.xaml.cs

@@ -16,8 +16,6 @@ namespace Artemis.Dialogs
         public static readonly DependencyProperty MarkdownProperty = DependencyProperty.Register("Markdown",
             typeof(string), typeof(MarkdownDialog), new PropertyMetadata(default(string)));
 
-        
-
         public MarkdownDialog(MetroWindow parentWindow)
         {
             ParentWindow = parentWindow;

Artemis/Artemis/Services/MetroDialogService.cs

@@ -60,13 +60,15 @@ namespace Artemis.Services
             if (window == null)
                 return;
 
+            window.Dispatcher.Invoke(() =>
+            {
                 var dialog = new MarkdownDialog(window)
                 {
                     Markdown = markdown,
                     Title = title
                 };
-
+                return window.ShowMetroDialogAsync(dialog);
-            window.Dispatcher.Invoke(() => window.ShowMetroDialogAsync(dialog));
+            });
         }
 
         public override async Task<bool?> ShowQuestionMessageBox(string title, string message)