Episrever Form rendering uses separate views for form elements, for example "
Try to add the view to the EditorTemplates folder instead.
Hi, unfortunatelly it doesn't help, looking throuch code there is this piece responsible:
viewEngineWrapper.FindPartialView((ControllerContext) htmlHelper.ViewContext, fragment.GetType().Name);
Here viewEngineWraper is of type CachingViewEnginesWrapper and result resolves to UtilViewEngine, which uses internal EPiserver view.
Maybe you can find something useful in this blog post: http://www.eyecatch.no/blog/2013/09/full-customization-of-xforms-with-episerver-7-and-mvc/