@Override
	public void postExecute(IExecutionInfo executionInfo) {
		super.postExecute(executionInfo);
		ValidateDiagramFeature validateDiagramFeature = new       ValidateDiagramFeature(this.getDiagramTypeProvider());
			this.getDiagramTypeProvider()
					.getDiagramBehavior()
					.executeFeature(validateDiagramFeature, new CustomContext());
	}

public void notifyChanged(Notification notification) {
			if (notification.getNotifier() instanceof Resource) {
				switch (notification.getFeatureID(Resource.class)) {
				case Resource.RESOURCE__IS_LOADED:
				case Resource.RESOURCE__IS_MODIFIED: {

@Override
	protected DefaultMarkerBehavior createMarkerBehavior() {
		return new MyDefaultMarkerBehavior(this);
	}