Having trouble rotating an IWICBitmap

I have read every resource I can find, and cannot make this work. I can read an image file into an IWICBitmap, convert it to an ID2D1Bitmap, and view it, all day long. But what I want to do is rotate the IWICBitmap 180 degrees, and store it back on disk. This is eluding me. Here is some code that reads an image from a file, and this works completely fine:

IWICFormatConverter* pWICConv = NULL;
IWICBitmapDecoder* pWICDecoder = NULL;
IWICBitmapFrameDecode* pWICBmpSrc = NULL;

//Create a decoder.
HRESULT hr = mpWICFactory->CreateDecoderFromFilename(
                      (LPCWSTR)FullPath, 
                       NULL, 
                       GENERIC_READ, 
                       WICDecodeMetadataCacheOnLoad, &pWICDecoder);

//Retrieve frame '0' and put it in pWICBmpSrc.
if (SUCCEEDED(hr))
  hr = pWICDecoder->GetFrame(0, &pWICBmpSrc);

/*Create a format converter using the IWICImagingFactory to convert the image data from one pixel format to another, etc.*/
if (SUCCEEDED(hr))
  hr = mpWICFactory->CreateFormatConverter(&pWICConv);

/*Initialize the format converter with all sorts of information, including the frame that was decoded above.*/
if(SUCCEEDED(hr))
  hr = pWICConv->Initialize(pWICBmpSrc,
                            mPixelFormatWIC,
			    WICBitmapDitherTypeNone,
                            NULL,
                            0.f,
  		            WICBitmapPaletteTypeMedianCut);


//Create the WICBitmap (mpImgWIC) from the Bitmap source 
hr = mpWICFactory->CreateBitmapFromSource(
                       pWICConv,
                       WICBitmapCacheOnLoad,&mpImgWIC);

The code above works great.  I can load images using IWICBitmap all day long, convert them to ID2D1Bitmaps, and view them, no problem.  But I here is the EXACT same code with a quick section inserted to rotate the IWICBitmap by 180 degrees.

IWICFormatConverter* pWICConv = NULL;
IWICBitmapDecoder* pWICDecoder = NULL;
IWICBitmapFrameDecode* pWICBmpSrc = NULL;

//Create a decoder.
HRESULT hr = mpWICFactory->CreateDecoderFromFilename(
                      (LPCWSTR)FullPath, 
                       NULL, 
                       GENERIC_READ, 
                       WICDecodeMetadataCacheOnLoad, &pWICDecoder);

//Retrieve frame '0' and put it in pWICBmpSrc.
if (SUCCEEDED(hr))
  hr = pWICDecoder->GetFrame(0, &pWICBmpSrc);

/*Create a format converter using the IWICImagingFactory to convert the image data from one pixel format to another, etc.*/
if (SUCCEEDED(hr))
  hr = mpWICFactory->CreateFormatConverter(&pWICConv);

/*Initialize the format converter with all sorts of information, including the frame that was decoded above.*/
if(SUCCEEDED(hr))
  hr = pWICConv->Initialize(pWICBmpSrc,
                            mPixelFormatWIC,
			    WICBitmapDitherTypeNone,
                            NULL,
                            0.f,
  		            WICBitmapPaletteTypeMedianCut);


///////////////////////////////////////////////////
/*This new section fails to do anything, but hr comes back
S_OK in both instances*/
IWICBitmapFlipRotator *FlipRotator = NULL;
if (SUCCEEDED(hr))
  hr = mpWICFactory->CreateBitmapFlipRotator(&FlipRotator);
if (SUCCEEDED(hr))
  hr = FlipRotator->Initialize(pWICConv, 
                             WICBitmapTransformRotate180);
///////////////////////////////////////////////////



//Create the WICBitmap (mpImgWIC) from the Bitmap source 
hr = mpWICFactory->CreateBitmapFromSource(
                       pWICConv,
                       WICBitmapCacheOnLoad,&mpImgWIC);

Can anyone tell me what I'm doing wrong?

Thanks!