/**
  * Gets the possible types for the parameter
  *
  * @return the possible types
  */
 private Set<Object> getPossibleTypes() {
   Collection<EObject> types =
       ModelSetQuery.getObjectsOfType(
           parameterOwner, UMLPackage.eINSTANCE.getTypedElement_Type().getEType());
   Set<Object> result = new HashSet<Object>();
   result.add("");
   result.addAll(types);
   return result;
 }
 /**
  * Queries the {@link ModelSetQuery} for all elements of given type and adds them to the choices
  */
 public void addElementsOfType(EClassifier ofType) {
   myElementsOfType.addAll(ModelSetQuery.getObjectsOfType(mySourceObject, ofType));
 }