GiD_Event_AfterReadPreferences: will be called just after GiD read from the user preferences file <f ilename> variables (first Tcl and then C++)
proc GiD_Event_AfterReadPreferences{ filename } { }
GiD_Event_AfterSavePreferences: will be called just after GiD saves in the user preferences file <filename> the variables (first C++ and then Tcl )
proc GiD_Event_AfterSavePreferences{ filename } { }