Sven suggested a new function
"AfxAvoidableMessageBox" that has a check box saying
"Do not display this again and remember my answer". This
is a good idea and we should extend it to a full class,
that handles not only MessageBoxes, but also dialogs
(like CFileCleanConfirm etc.).
This class should fill a list box in the options dialog with
entries where the user can enable/disable all questions
and messages separatly.
This class would handle the showing of a dialog.
If the dialog shall not be shown, then it just returns the
remembered answer of the user.