Setting different background

Im new to windows programming and im trying to change the background color of a edit box doeing:

Code:

---

                case WM_CTLCOLOREDIT:
        HDC hdc;
        hdc = GetDC (controls[0]) ;
        SetBKColor(hdc,RGB(30,50,80));
        ReleaseDC (controls[0], hdc) ;
                break;

---

But it doesnt work. What i must do?

http://msdn.microsoft.com/library/de...lcoloredit.asp
http://groups.google.com/group/comp....a34f9a3c664394
http://cboard.cprogramming.com/searc...earchid=539981