Here is a short video clip of the first comb that the bee's have drawn in my top bar hive. It is neat to see the bee's festooning (hanging on each other) while making the comb.
I transferred the bee's from their nuc hive in four standard langstroth frames. I built this top bar hive to be compatible with the langstroth frames for this reason. The bee's have been busy filling up these four frames and finally started building comb on the top bar. Besides the top bar in this video, there is one other that has some comb on it.