TD5 Hardtop Roof Trim Sagging

It's not a huge issue, but the roof trim in the rear of my 2006 Hardtop is drooping a little around the high level off-side window. I could ask the dealer to take a look at it (it's under warranty) but would prefer to fix it myself and avoid the probability of dirty fingerprints over the lining!! How is the roof trim fixed??

in all likey hood its not fixable as most linings are foam backed. the foam breaks up over time and seperates from the material. if you try to glue it the glue comes through and any dirt,dust and other airborne crap sticks to it.
if you do a search for sagging headlining you should find a link to a company that can supply all yer need to redo it

The material isn't detached from the foam backing, the problem is that the semi-rigid backing has drooped over the window - we are only talking an inch or so. Was curious to learn how it was fixed to the roof?