Back button not displaying for non-tab view

I have a standard tabbed app but I also want to have a search screen that is not a tab. (I didn’t want to use a modal for the search page because I want to be able to navigate back to the search results page after clicking on a result)

Anyway, I can’t seem to get the ion-nav-back-button to appear on the search page. I’ve modified the standard tab codepen to show the issue. Click the ‘Scientific Facts’ button on Home tab - no back button appears. http://codepen.io/emertechie/pen/eyKqd

Any pointers?

Thanks

Ok think I was going against the grain too much as each tab view gets it’s own history stack. I’ve decided to go with a modal after all and just use a search service to restore the last search state.