@PostConstruct
public void createPartControl(Composite parent, MPart part, MWindow window) {
        *    *    *
    ISaveHandler saveHandler = new ISaveHandler() {
        @Override
        public Save[] promptToSave(Collection<MPart> arg0) {
            return null; // I don't have any situations where this could happen
        }
        
        @Override
        public Save promptToSave(MPart part) {
            if (part.isDirty()) {
                boolean confirm = MessageDialog.openConfirm(shell, "Lose changes?",
                    "Closing this editor will lose any unsaved changes.\n" +
                    "Are you sure you want to do that?");
                return (confirm ? Save.NO : Save.CANCEL);
            } else {
                return Save.NO; // Mine don't actually save
            }
        }
    };
    window.getContext().set(ISaveHandler.class, saveHandler);

    IWindowCloseHandler handler = new IWindowCloseHandler() {
        @Override
        public boolean close(MWindow window) {
            if (!partService.getDirtyParts().isEmpty()) {
                return MessageDialog.openConfirm(shell, "Lose changes?",
                    "Closing this window will lose any unsaved changes in editors.\n" +
                    "Are you sure you want to do that?");
            } else {
                return true;
            }
        }
    };
    window.getContext().set(IWindowCloseHandler.class, handler);