public Number getPercentComplete(int row, int column);

    /**
     * Returns the percent complete for a given item.
     *
     * @param rowKey  the row key.
     * @param columnKey  the column key.
     *
     * @return The percent complete.
     *
     * @see #getPercentComplete(int, int)
     */
    public Number getPercentComplete(Comparable rowKey, Comparable columnKey);