Need help on Drill Through Setup

[SSNCOG]

Hi,

I have a combination chart(Bar & Line) having 2 measures in series and 2 data items nested in categories.
Measure 1 represent bar and Measure  2 represent line in the graph.
when I click on line it has to drill through to report child 1. if I click on bar,it has to drill througj to Child 2 report.

If any body have done this or have an idea how to do this then please help me,Its an urgent.

Cognos 8.4, Chart uses DMR and Child report uses Relational Package.

Thanks for your help in advance.

Thanks,
SSNCOG