SDB>It may be a good idea not to mix the code too much with MFC and WTL classes used anywhere, as it could become quite confusing. An efficient way could be defining inline helper functions that translates WTL arguments to their MFC counterpart, unless you want to write the required functions using only WTL. Note that you can safely mix WTL objects with MFC code, but you always need to specify the WTL namespace when appropriate.