The control element accomplishes a subclassing for a
window stated by its handle. The window function is the
function of a window, which completely determines the
behavior of the window (and thus the reaction of the
window to user inputs). This window function is
replaced by another function by the Subclassing
component. This function then can be freely defined in
the Message event of the Subclassing control element
(MS Windows API programming). It is possible to either
replace (StopMessage = True) or only to supplement the
original window function (StopMessage = False). The
latter aspect is called also Superclassing.

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