how to use task label of Gantt chart as drill-through interactivity parameter

opa

Hi,

I have a small problem. I created a Gantt chart for a project, consisting of some subprojects, to show the progress of the whole project. As task labels I'm using the subproject names, as normal labels the used working hours of any subproject.
Now I want to use the task label (==subproject names) as a parameter when I call a second Gantt chart to show the progress of the subprojects via drill-through interactivity, but I can't find a possibility to pass the task label value from the first report to the second report, I only can pass the values CategoryData, ValueData and ValueSeriesName.

Please give me a hint to solve this.

Thanks in advance,

Joerg

P.S. I forgot the following: I'm using BIRT Report Designer 2.5.0