Magga, you can try to put organza baggies around the green seedpods, so you don't loose the seeds.
To me it seems the flowers are a bit upright, so even without bagging them, you might be able to collect them.
I have Chaenorhinum origanifolium, it seems to grow like your Cymbalaria
http://www.stauden-stade.de/sh...
From these ones I can collect the seeds quite easy, the seedpods open at the top, so I cut the stalks off when the seeds are ripe.
I have Cymbalaria muralis, that is even smaller, but it has not set seed yet, still in full bloom. Will let you know how I did that, if I don't forget. Most plants of the same genus will set seed in the same way.
