Creating reports with work item children and parent

Hi,

Does anyone have any example with RTC report where you have a list of work items, and below every row of that work item you have a list of it's children?

I found usefull example at

https://jazz.net/wiki/bin/view/Main/ReportsCentral#Links

but I need to customize it to get what I want (I mentioned before). This example gives entering id of work item as report parameter, but I need something else.
So, any help would be appreciated!