What are you trying to achieve ? This lib is meant for regular mobile UI and from what I tested, it works as expected. You usually setup a TabBarMobile, a Navigator and a ToolBar so you have your framework. You can add a splitter if you want an hamburger menu and then you can design your pages.
Don't worry, maybe I was expecting too much freedom of customization, I don't know, but I don't have time to spend on simple things like that, so for now I'll use an external editor to make the UI the way I want it.
Thanks anyway