win32 - how can i put a child control transparent?

please someone correct me very.
i readed several texts about doing a child control transparent, but i can't put it to work correctly. my last working code was with Regions, but not always works :(
i have readed, too, about bitmap brushes, but i need more information and advices. i even have readed about WM_PRINTCLIENT(for print the parent DC to child DC), but without sucess too :(
sorry. but i continue with same problem :(
how can i build an irregular shapes child controls without using Regions?
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