null not permitted).
@param row the row index (zero-based).
@param column the column index (zero-based).
@return The tooltip text (possibly null).
null not permitted).
@param row the row index (zero-based).
@param column the column index (zero-based).
@return The tooltip text (possibly null).
null to indicate that no tool tip should be displayed for an item.
@param dataset the dataset (null not permitted).
@param key the section key (null not permitted).
@return The tool tip text (possibly null).
null not permitted).
@param series the series index (zero-based).
@param item the item index (zero-based).
@return The tooltip text (possibly null).
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