Drill through in Microchart

[dsmuker]

i am using microchart to population count country  and state wise.
In the category axis i have nested axis with parent and country with child as state. The measure axis is the population count. 

In the target report i have a list that with filters based on country and state. 

When in the source graph  i try to set the drill through definition with parameters to pass the data item values for both country and state fields, it does not work.
Infact the link on column itself is not activated.

Any suggestion?

Thanks
Gary