How to create a Back stack so tapping several Action Bar navigation Tabs takes you back through the tabs
<p>The app has an Action Bar, the action bar has several navigation tabs on it. If someone runs the app this happens:</p>

<ol>
<li>Open app, view content in fragment 1 (tab 1)</li>
<li>Tap tab 2, see content in fragment 2.</li>
<li>Tap tab 3, see content in fragment 3</li>
<li>Hit Back. The fragment vanishes, and the tab content is left empty. Hit back again, another blank fragment shows, hit back again and another blank fragment, hit back again, you exit the app.</li>
</ol>

<p>What I want to happen is for someone to visit a series of tabs, then use Back to cycle back through them. I've spent hours trying to figure it out and I'm stumped. Help a guy out of his misery?</p>
