SystemUserInterface c = (SystemUserInterface) getChildItem(Controller.SYSTEM_USER_INTERFACE);
SystemUserInterface c = (SystemUserInterface) getChild(Controller.SYSTEM_USER_INTERFACE);
    protected Item getItem(Space p) throws Exception {        Item i = null;        SystemUserInterface c = (SystemUserInterface) getChildItem(Controller.SYSTEM_USER_INTERFACE);        if (c != null) {            i = c.getChildItem(p);        } else {            throw new Exception("Could not get item. The system user interface is null.");        }        return i;    }