if (destinationSortKey() == null)
if (destinationSortKey() == null || destinationSortKey().length() == 0)
    protected String _localSortKey() {        if (destinationSortKey() == null) {            setDestinationSortKey((String)valueForBinding("destinationSortKey"));            if (destinationSortKey() == null)                setDestinationSortKey(_localDestinationDisplayKey());        }        return destinationSortKey();    }