Does MediaCapture::CapturePhotoToStorageFileAsync support UVC Still Image Capture method 2 for Metro Style APP?

Question

Dear Sirs:

My webcam supports UVC Still Image Capture method 2.
This is confirmed by USBVIEW.EXE program reporting that:
    * the bStillCaptureMethod field in Class-specific VS Interface Input Header Descriptor is 2 (Mehtod 2)
    * the Still Image Frame Type Descriptor contains 13 entries    

I used the following code to capture a still image.

void App1::MainPage::OnCapture(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e)
{
  if(!m_liveviewOn) return; 

  concurrency::task<StorageFile^>(KnownFolders::PicturesLibrary->CreateFileAsync("altekPhoto.jpg", CreationCollisionOption::GenerateUniqueName))
  .then([this] (concurrency::task<StorageFile^> a_task)
  {
	  try
	  {
	    StorageFile^ vfile = a_task.get();
        concurrency::task<void>(m_ctr.Get()->VideoDeviceController->SetMediaStreamPropertiesAsync(MediaStreamType::Photo, m_PhotoType))	
	    .then( [this, vfile] (concurrency::task<void> a_recordTask)
		{
		  ImageEncodingProperties ^iep = ImageEncodingProperties::CreateJpeg();
		  return m_ctr->CapturePhotoToStorageFileAsync(iep , vfile);
		})
        .then ([this, vfile] (concurrency::task<void> a_recordTask)
		{
			  TextBlock^ tb = safe_cast<TextBlock^> (this->FindName("TEXTBLOCK_Status"));
			  tb->Text = L"Capture to : " + vfile->Path;

	          return  m_ctr.Get()->VideoDeviceController->SetMediaStreamPropertiesAsync(MediaStreamType::VideoPreview, m_PreviewType);
		});
	  }
	  catch (Exception^ ex)
	  {
        OutputDebugString(ex->Message->Data());
      }
  });
}

The MediaCapture::>CapturePhotoToStorageFileAsync did not act as UVC method 2 behave described in "USB Device Class Definition for Video Devices" section 2.4.2.4.
It just acts as UVC method 1 behave.

I also query the MediaCapture::MediaCaptureSettings::VideoDeviceCharacteristic and it reports that AllStreamsIdentical (4)

I query the MediaCapture::VideoDeviceController::GetAvailableMediaStreamProperties
and it reports that the VideoPreview, VideoRecord, and the Photo are all of the same formats.

My questions:
  1. How can I make MediaCapture::>CapturePhotoToStorageFileAsync to perofrm UVC method 2 behave with a webcam supporting UVC Method 2?
  2. How can I query Still stream formats with a webcam supporting UVC Method 2?

Thanks,