removeRightOrganizer((Organizer) getChild(n));
removeRightDisplayItem((DisplayItem) getChild(n));
    public void removeChild(String n) throws Exception {        if (n != null) {            if (n.isEqualTo(SplitPane.LEFT_ORGANIZER)) {                removeLeftOrganizer((Organizer) getChild(n));                        } else if (n.isEqualTo(SplitPane.RIGHT_ORGANIZER)) {                removeRightOrganizer((Organizer) getChild(n));            }        } else {            throw new Exception("Could not remove item. The name is null.");        }        super.removeChild(n);    }