postInnerEventNotify(ChangeEvent event) This method will be called right after OM change was performed and we
possibly need to change other elements in OM accordingly this change.
final void
preInnerEventNotify(ChangeEvent event) This method will be called before OM change was performed and we possibly
need to collect some information.
throws: could - throw VetoException.
This method will be called before OM change was performed and we possibly
need to collect some information.
throws: could - throw VetoException. It means that some visitor rejectchange.