public void addItems(final T[] items) {
        for (final T item : items) {
            addItem(item);
        }
    }
This function will be used to optionally provide a rendered form of the item instead of plain text.
If not set then it will fall back on displayValueFunction, {@link HasDisplayValue} or
{@link Object#toString()}.
stroom-core-client-widget/src/main/java/stroom/item/client/SimpleSelectionListModel.java