Ionic sidemenu does not re-appear after $state.go

This looks like a straight forward thing to do, but, somehow, it does not work.

All I am trying to do is,
1. a main page with a side menu
2. Side menu has an item that navigates to another template
3. The template has a button to go back to the main menu state.
4. After clicking the button, the main page comes back. But the hamburger menu icons dont re-appear.

There is a pen here: http://codepen.io/sanga/pen/XmwMWL

In the pen:
1. Open the side menu
2. Select "Upload"
3. Hit "Back" on the Upload screen
4. Side menu does not appear on main screen

I tried $timeout wrap. Did not help. What am I missing ?

Thanks,
Sanga