2006/11/23 12:17:30 fs 1.7.32.2: getSupersededProperties not needed anymore, after the previous fix
2006/11/23 12:06:25 fs 1.7.32.1: #i70109#
- removed the ActionButtonType property, ButtonNavigationHandler now again
  working with ButtonType
- as a consequence, it's now defined that if a handler supersedes a property,
  then all handlers which previously registered for changes of this
  property (getActuatingProperties) will not be notified anymore. Reasoning
  is that the new handler could given the property a new semantics, type,
  whatever, which the previous handlers would not expect.