public void setSeriesItemLabelsVisible(int series, boolean visible);
    
    /**
     * Sets a flag that controls the visibility of the item labels for a series.
     * 
     * @param series  the series index (zero-based).
     * @param visible  the flag (<code>null</code> permitted).
     */
    public void setSeriesItemLabelsVisible(int series, Boolean visible);
    
    /**
     * Sets the visibility of item labels for a series and, if requested, 
     * sends a {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param series  the series index (zero-based).
     * @param visible  the visible flag.
     * @param notify  a flag that controls whether or not listeners are 
     *                notified.
     */
    public void setSeriesItemLabelsVisible(int series, Boolean visible, 
                                           boolean notify);
    
    /**
     * Returns the base setting for item label visibility.
     * 
     * @return A flag (possibly <code>null</code>).
     */
    public Boolean getBaseItemLabelsVisible();
    
    /**
     * Sets the base flag that controls whether or not item labels are visible.
     * 
     * @param visible  the flag.
     */
    public void setBaseItemLabelsVisible(boolean visible);
    
    /**
     * Sets the base setting for item label visibility.
     * 
     * @param visible  the flag (<code>null</code> permitted).
     */
    public void setBaseItemLabelsVisible(Boolean visible);
    
    /**
     * Sets the base visibility for item labels and, if requested, sends a 
     * {@link RendererChangeEvent} to all registered listeners.
     * 
     * @param visible  the visibility flag.
     * @param notify  a flag that controls whether or not listeners are
     *                notified.
     */
    public void setBaseItemLabelsVisible(Boolean visible, boolean notify);

    // ITEM LABEL GENERATOR

    /**
     * Returns the item label 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 XYItemLabelGenerator getItemLabelGenerator(int row, int column);