BitBlt from MemDC in to a CPDFControl::DC not working

I am having a problem using BitBlt from a MemDC into a CPDFControl:DC. No matter which ROP mode I choose I get either a black box, a white box, or nothing. But I never get the actual bitmap. If I BitBlt from a MemDC to a printer or a screen DC it works fine.

Any ideas?