ATL开发ActiveX时创建RichEdit出问题请高手帮忙

问题： ATL开发ActiveX时创建RichEdit出问题请高手帮忙
描述:

创建一般的EDIT时正常： hWnd = CreateWindow ("edit",
                        "",
                        WS_VISABLE,
                        CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,   
                        CW_USEDEFAULT,
                        NULL,
                        NULL,
                        NULL,
                        NULL);
但在创建RichEdit时出错（找不到窗口类型）：
hWnd = CreateWindow ("RichEdit",
                        "",
                        WS_BORDER|ES_MULTILINE,
                        CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
                        CW_USEDEFAULT,
                        NULL,
                        NULL,
                        NULL,
                        NULL);
或者HWND hWnd = CreateWindow (RICHEDIT_CLASS,
                        "",
                        WS_BORDER|ES_MULTILINE,
                        CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, 
                        CW_USEDEFAULT,
                        NULL,
                        NULL,                        
                        NULL,
                        NULL);
都提示相同错误，修改第三个参数仍无法实现。请高手指点。如何才能创建一个RichEdit？