@Override
	public void notify(LifecycleEvent event) {
		if (event.eventType == EventType.PICTOGRAMELEMENT_ADDED) {
			Connection c = (Connection) event.target;
			Shape s = (Shape) c.getEnd().getParent();
			BaseElement be = BusinessObjectUtil.getFirstBaseElement( s );
			// determine if this is one of your custom shapes and modify accordingly...
		}
	}

@Override
public IAddFeature getAddFeature(IFeatureProvider fp) {
	return new AddIntermediateCatchEventFeature(fp) {

		@Override
		protected void decorateShape(IAddContext context,
				ContainerShape containerShape,
				IntermediateCatchEvent businessObject) {
			super.decorateShape(context, containerShape,
					businessObject);

			setFillColor(containerShape);

			// add a notifyChangeAdapter to validate the ActiviytID
		    businessObject.eAdapters().add(new ImixsEventAdapter());
		    
		}
	};
}

	public void notifyChanged(Notification notification) {
		IntermediateCatchEvent imixsEvent = null;
		if (ImixsBPMNPlugin.isImixsEvent(notification.getNotifier())) {
			imixsEvent = (IntermediateCatchEvent) notification.getNotifier();
			int type = notification.getEventType();
			if (type == Notification.ADD) {
				// add notification - test if this is a SequenceFlow...
				if (notification.getNewValue() instanceof SequenceFlow) {
					// compute next processid.....
					....
					// update the business object....					
					imixsEvent.eSet(feature, currentActivityID);

				}
		....

public class ImixsValidator extends AbstractModelConstraint {

	public IStatus validate(IValidationContext ctx) {
		EObject eObj = ctx.getTarget();
		EMFEventType eType = ctx.getEventType();
...
}

@Override
public void notify(LifecycleEvent event) {
	if (event.eventType == EventType.BUSINESSOBJECT_CREATED) {
		EObject object = (EObject) event.target;			
		if (object instanceof IntermediateCatchEvent) {
                               // so far it works...
			EStructuralFeature feature = ModelDecorator.getAnyAttribute(
					(IntermediateCatchEvent) object, "activityid");
                               // feature is always null 
			if (feature != null && feature instanceof EAttribute) {
				if (ImixsRuntimeExtension.targetNamespace
					.equals(((EAttributeImpl) feature)
							.getExtendedMetaData().getNamespace())) {
					object.eAdapters().add(new ImixsEventAdapter());
				}
			}
		}

void updateMyObject(EObject object) {
  try {
    object.eSetDeliver(false);
    object.setSomeAttribute("Hello world");
  }
  finally {
    object.eSetDeliver(true);
  }
}