SOS! real working transparent edit? it's possible in Windows?

Hi,

I want to make a dialog with a bitmap on it and an edit box with transparent background.
I tried CMyBitmapDialog::OnCtlColor and pDC->SetBkMode(TRANSPARENT) and return m_HollowBrush but the problem
is that this is not working because when you type some characters than press backspace then Windows uses m_HollowBrush
and nothing will be deleted (== repainted with the background) but repainted with hollow == nothing.

Has anybody solved this problem?

Please give me a help or any link to sample sources.

Thank you very much,
Herbie