Mark BuildModel method in DefaultViewService class as virtual

source/Core/Services/DefaultViewService/DefaultViewService.cs

@@ -261,7 +261,7 @@ protected string FormatHtmlTemplate(string htmlTemplate, object model)
         /// or
         /// scripts
         /// </exception>
-        protected object BuildModel(CommonViewModel model, string page, IEnumerable<string> stylesheets, IEnumerable<string> scripts)
+        protected virtual object BuildModel(CommonViewModel model, string page, IEnumerable<string> stylesheets, IEnumerable<string> scripts)
         {
             return BuildModelDictionary(model, page, stylesheets, scripts);
         }