public void setSeriesItemLabelGenerator(int series, 
                                            XYItemLabelGenerator generator);

    /**
     * Returns the base item label generator.
     *
     * @return The generator (possibly <code>null</code>).
     */
    public XYItemLabelGenerator getBaseItemLabelGenerator();

    /**
     * Sets the base item label generator and sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     *
     * @param generator  the generator (<code>null</code> permitted).
     */
    public void setBaseItemLabelGenerator(XYItemLabelGenerator generator);

    // TOOL TIP GENERATOR

    /**
     * Returns the tool tip generator for a data item.
     *
     * @param row  the row index (zero based).
     * @param column  the column index (zero based).
     *
     * @return The generator (possibly <code>null</code>).
     */
    public XYToolTipGenerator getToolTipGenerator(int row, int column);