Subclassing ActiveX - Version 1.0 The control element accomplishes a subclassing for awindow stated by its handle. The window function is thefunction of a window, which completely determines thebehavior of the window (and thus the reaction of thewindow to user inputs). This window function isreplaced by another function by the Subclassingcomponent. This function then can be freely defined inthe Message event of the Subclassing control element(MS Windows API programming). It is possible to eitherreplace (StopMessage = True) or only to supplement theoriginal window function (StopMessage = False). Thelatter aspect is called also Superclassing.