Helper method to find a type in the UML2 model, or cause its propagation
from the source to the UML2 model (that means, it will be created in the
UML2 model).
Edit part for FlowElements (elements using a FlowLayout) e.g. attributes,
methods and attributevalues
This edit part must implement the PropertyChangeListener interface, so it can
be notified of property changes in the corresponding model element.