Side menu + tabs : back navigation doesn't work

I have a side menu application and a tabbed page with in that. But the back button is not getting displayed when I navigate to the tabbed page.

You can find my code here: http://codepen.io/vinaylakkam/pen/vEXwVW

Can you please help me to achieve back button display in the tabs page

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Can someone help. Iā€™m still trying to figure this out.