CStatic-Derived class won't paint background

Last post wasn't clear enough.

I need to paint the background of a CStatic control created dynamically this way:

-----------Code Snippet:------------------

CUnknownCtrl* pUnknown;
pUnknown = new CUnknownCtrl;
pUnknown->Create("Text", SS_CENTER | WS_CHILD | WS_VISIBLE | WS_GROUP, CRect(11,35,360,526), this, 0x31);
----------------------------------------------

Notice that CUnknownCtrl is a CStatic-derived mfc class.

I can't figure out how to set background color of the label created with this code, someone can help me?
Calling OnCtlColor inside CUnknownCtrl won't even be executed and OnPaint fails. Some idea?

Thanks for advance

Handle WM_ERASEBKGND in the CUnknownCtrl class

Thanks! :D