I have two list reports in a 2-column table side-by-side. The report on the left is a summary, one on the right, detailed.  There is a parametrize filter setup on the detail report to the right and drill-through has been set up from the summary to the detail report. The filter passes a simple Product_Code query item as the drill-through.
There challenge here is to drill though on the summary list, but showing the target only after a drill has been performed.
For example, the initial view when this dashboard report is executed, is the summary list with the associated columns and the data, but only the column headings without data are shown in the detail report to the right.
When a user drills through on the Product_Code on the summary report, the detail report would automatically show the resulting data following the drill.
I know this behavior is possible to achieve as I've run across either a KB, Multimedia KB, or SupportLink article, but now I cannot recall where.
Any advice is highly sought out and appreciated.
Cheers!
Shawn