WM_CTLCOLORBTN message

hello, everyone.
I create a dialog project, then i put a radio button on it.
after that, i put a BMP picture on the dialog's background.
the radio button's background is grey, i want to remove its background.

in order to set the radio button's background transparent, i handle the 
WM_CTLCOLORBTN message in dialog. eg. MSG_WM_CTLCOLORBTN

but, it seems,  i can't receive the message.

so, how to set the control's background transparent ??
thanks.



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