Transparence in CPropertySheet

Hi,

I have a CPropertySheet and I would like its background to be transparent. I have try to overload OnCtlColor and do something like pDC->SetBkMode(TRANSPARENT) but nothing change.

So, what is the best way to do this, and at least how to do the same thing with the CPropertyPage ?

Thanks in advance.
Frédéric Naudeau.