Comments by ColbyZhouCoding (Top 1 by date)

Are you sure you use it in a custom control, and the class that related to the control is derived from CWnd?

I just add the OnMouseWheel event the same way I add OnVScrol. I set a break point in OnMouseWheel method and scroll my mouse when I debug, it just does not go in! But the OnVScrol event does!

I don't know what I have done wrong.