Having problems with Ionic ui-router and nested states

I am having trouble wrapping my head around the ui-router and nested states. I am trying to navigate from a main page to a tabbed view. When the app changes from the main view to tab view it looses routing and has no nav buttons to go back to the main page.

I have created a plunker showing what I am trying to accomplish.

Any help with this?

Thanks,

Robert