Hi,
If you work with TechSupport on this you can show them your code and your screen shots and they can help you resolve your issue.
There are a lot of different ways you could be doing drill downs ... From OLAP cubes, from graphs to static reports, from graphs to dynamic drill down reports, from summary tables to static or dynamic detailed reports, etc, etc and the code and method will make a difference in the answer.
Tech Support is your best resource.
Cynthia