title: ReportViewerForMvc PartialView exception
body: <p>This is my _ReportViewer.cshtml partial view:</p>
  
  <pre><code>@using ReportViewerForMvc
  @Html.ReportViewer(ViewBag.ReportViewer as Microsoft.Reporting.WebForms.ReportViewer, new { scrolling = "no", style = "width: 100%; border-width: 0px" })
  </code></pre>
  
  <p>and my MVC action returns PartialView("_ReportViewer"); which throws "THE CONTROLLER FOR PATH '/REPORTVIEWERWEBFORM.ASPX' WAS NOT FOUND OR DOES NOT IMPLEMENT ICONTROLLER." exception.</p>