TFS tree query

hi,

i need an hierarchical list of ...

1. all epics containg a special tag

2. all features (as childs of those epics) containg a special tag  

3. all ProductBacklogs as childs of those features

a simple tree in 3 levels. the top and the second levels have options. the third level has no option.

i can't get in to work

has somebody an idea?

best,

martin.