EditorFor isn't using EditorTemplate in MVC4

Question

I'v been bashing my head against a wall trying to get EditorFor working as described here, but I can't for the life of me get my version to work.

I have two ViewModels:

InterviewViewModel

public class InterviewViewModel
{
    ...
    public List<QuestionViewModel> Questions { get; set; }
}

and QuestionViewModel:

public class QuestionViewModel
{
    public int QuestionId { get; set; }
    public string QuestionName { get; set; }
    ...
}

I have tried creating EditorTemplates in two places,

/Views/Interview/EditorTemplates/QuestionViewModel.cshtml

and

/Views/Shared/EditorTemplates/QuestionViewModel.cshtml

Neither one appears to do anything.

Controller code:

public ActionResult MyClass(int id = 0)
    {
        using (RRContext db = new RRContext())
        {
            ...

            List<QuestionModel> questionModels = new List<QuestionModel>();
            questionModels = db.QuestionModels.ToList();

            ...

            viewModel.Questions = questionViewModels;

        return View(viewModel);
        }
    }

My View contains:

@model ResidentRank.Models.Interview.InterviewViewModel

... (html.beginform is here)
Html.EditorFor(model => model.Questions);      

EditorTemplate code:

@model ResidentRank.Models.Interview.QuestionViewModel
<div style="clear:both; margin:10px 0px;">
  <label>@Html.DisplayFor(m => m.QuestionName)</label>
  @Html.DropDownListFor(m => m.SelectedQuestionOption, Model.OptionSelector)
</div>

The question banging around in my head is "WHY IS THIS NOT WORKING?!"

Answer 1

In HomeController

    [HttpGet]
    public ActionResult Display(int id = 0)
    {
        var questionViewModel = new InterviewViewModel {
            Questions =
                new List<QuestionViewModel>()
                {
                    //Hard coded values to represent data coming from db i.e db.QuestionModels.ToList();
                    new QuestionViewModel() {QuestionId = 1, QuestionName = "A"},
                    new QuestionViewModel() {QuestionId = 2, QuestionName = "B"}
                }
        };

        return View(questionViewModel);
    }

ViewModels

  public class InterviewViewModel {
    public List<QuestionViewModel> Questions { get; set; }
  }

  public class QuestionViewModel {
    public int QuestionId { get; set; }
    public string QuestionName { get; set; }
  }

\Views\Home\Display.cshtml

  @model MvcApplication1.Models.Interview.InterviewViewModel

  @using (Html.BeginForm()) 
  {
      <fieldset>
         @Html.EditorFor(x => x.Questions)
         <input type="submit" value="Save" />
      </fieldset>
  } 

\Views\Shared\EditorTemplates\QuestionViewModel.cshtml

Make sure this is a partial view.

  @model MvcApplication1.Models.Questions.QuestionViewModel
  <div style="clear:both; margin:10px 0px;">
     <label>@Html.DisplayFor(m => m.QuestionName)</label>
  </div>

Note that I removed the

  @Html.DropDownListFor(m => m.SelectedQuestionOption, Model.OptionSelector)

for to keep the view simple.

This displays..