Well my thought was, since it is going to be a game "dev" tool, it should use the desktop styling instead of in render UI. I would Probably just use in game things if I can't figure it out.
Thank you for telling me there is a way to do this! Are there any resources point me at about this?
By the way, what I want to make is a way to edit structure block files outside of game. The reason is I make some structures that trigger something on loading it into the world. I don't think mcedit can open structure block files, I think it can only open schematic files tell me if I am wrong.