Powerbuilder : How to compare the old value and new value of a column in data window

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Published on 2010-06-15T05:12:14Z Indexed on 2010/06/15 5:12 UTC
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Suppose I have a datawindow object which is attached to a datawindow control named 'dw_detail". This object uses grid presentation style and has a database column named 'found'. Now when a user modifies that column's value, I want to compare it with the original value that was fetched from the database. I know I can access the value of that column as 'dw_detail.object.found[row_no]'. Now I am trying to access the original value of the column as 'dw_detail.object.found.original[row_no]', but it is not working. It is not giving any compiling error, but when I debugged, 'dw_detail.object.found.original[row_no]' contains no values.

How can I access the original value of that column?

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