validateStatus = new AggregateValidationStatus(bindingContext, AggregateValidationStatus.MAX_SEVERITY);
validateStatus.addChangeListener(new IChangeListener() {
	@Override
	public void handleChange(ChangeEvent event) {
		final IStatus status = (IStatus) validateStatus.getValue();
		Display.getCurrent().asyncExec(new Runnable() {
			@Override
			public void run() {
				if (!parent.isDisposed())
					checkPageStatus(status);
			}
		});
	}
});