The CWnd object receives this call after the window is created but before it becomes visible. OnCreate is called before the Create or CreateEx member function returns.
Override this member function to perform any needed initialization of a derived class.
The CREATESTRUCT structure contains copies of the parameters used to create the window.
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.