public void removeReferencedElement(ModelElement x) throws PropertyVetoException {
if (_referencedElement == null) return;
fireVetoableChange("referencedElement", _referencedElement, x);
_referencedElement.removeElement(x);
}
public void addReferencedElement(ModelElement x) throws PropertyVetoException {
if (_referencedElement == null) _referencedElement = new Vector();
fireVetoableChange("referencedElement", _referencedElement, x);
_referencedElement.addElement(x);
}