To Know the value of the field where the user click on the report

Hi,
I want to know the the value of the field where the user click on the report.I am showing a transaction report and if the user click on the transaction number then i will have to show the sub report of that particular transaction type as in my case transaction number is uniqe.
[298 byte] By [Nabin] at [2007-12-25]

Visual Studio

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