PropertyChangeSupport is being added to the entity beans.
2 notes from Mario:
1. The PropertyChange event needs to be fired
AFTER the value has been changed in the model and not before.
This is VERY important I think, as a library might use the
PropertyChangeEvent just as trigger to react, but read the value from
the model instead of using the one from the event. The Javadoc in
* @param propertyName The programmatic name of the property
* that was changed.