These Adromischus species are quite attractive. Unfortunatelly they are also fragile and slow-growing. And even though they can be propagated by rooting their leaves it can take months until the leaf will turn into a new plant.
The two green forms below have been separated from the mother plant in September 2013 and this is how they look like now. While the roots came out quickly (in a month or so) it took half a year for one of them and almost a year for the other to develop new leaves. As you can see even the rooted leaves get quite fat roots. I might raise them in time... in ten years time most likely.
This one has grown its roots to this size in two months :)
In conclusion, if you got a dwarf Adromischus in the mail and some leaves have come off don't be sad - they will make new tiny plants if you're patent!