while converting some of my existing notes into dendron hierarchies, I tried to use schemas to structure them a bit better. Got it finally working, but I guess both the schema statement AND the related note has to be in place before dendron shows those properly in the lookup (?). I first tried to create just the schema statements, and wondered why I cannot see them in the lookup dropdown (or maybe I just did something incorrectly). Anyway if there is such a relation, I managed to miss it while reading the documentation.