[Lazarus] How to associate an object with a row in TStringGrid

[Dennis]

when displaying data in a TStringGrid, I want to associate an object 
with each row of the grid so that when later use select a certain row, I 
can just determine the selected row and then retrieve the associate 
object for further processing (e.g. display further information of this 
object in some controls).

How do I do that?

Currently, I use OnSelection  (Sender: TObject; aCol, aRow: Integer) to 
obtain aRow but how do I associate an object with each row?

Thanks.

Dennis
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