Navigation not working in example

[bafplus]

The noob that i am is using the suplied example as boilerplate for my app. Everything works fine. Now i want to add 1 or 2 static text widgets/pages but i cant seem to get the navigation in the bottomNavigationBar working. Can somebody take a look at that and maybe even get it to work?

I just cant wrap my head around why it isnt working, and the noobnes of me prevent me from fixing.