2018-03-06 16:02 GMT-03:00 Alexandre Torres Porres <porres@gmail.com>:
I have a couple of such examples in my library.

Actually I have much more, dozens of it, as I don't think any non graphical abstraction of mine needs properties! I was just thinking and meant about the graphical ones, which even so don't always need properties... but I forgot to mention about the non graphical ones.

cheers