The framework calls this member function prior to the WM_CREATE message when the CWnd object is first created.
Points to the CREATESTRUCT data structure for CWnd.
This member function is called by the framework to allow your application to handle a Windows message. The parameters passed to your function reflect the parameters received by the framework when the message was received. If you call the base-class implementation of this function, that implementation will use the parameters originally passed with the message and not the parameters you supply to the function.