I just checked and I saw them. They only pop out prominently (and briefly) when you pull some Gs in a flat turn, so I guess it can be easy to miss ..
I tried putting the 109 in a steep climb to bleed off all my speed and checked the slats while doing so. Nothing happened.
I'm not 100% certain they should pop out under these conditions or at which angle of climb they still can and should pop out. (Could be that their own weight holds them in if your climb is too steep, *shrug*). In a shallower climb I *think* I saw them move briefly .. but not as prominently as in the tight turn.