How to access the content of BITBLT ?

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Hi
I am using a BITBLT Operation that was added by a userlib (fast Get Desktop example). It works nicely, there is only one problem: I cannot access the Pixels delivered by BITBLT. The image is on my blitz window, but when I use CopyRect (both, backbuffer and frontbuffer), all I get is an empty image. It seems like BITBLT is only sticking a canvas onto the blitzwindow, but doesn not really paint into the blitz buffer.

How could this be solved? (Currently I am using GetPixel, but it's WAY to slow, I urgently need something better.) Is there a way to make BitBLT draw directly into Blitz's Backbuffer? Or even better, into a Blitz Image Buffer?