title: when FragmentTransaction call show method?
body: <p>I want transition fragment A to fragement B.
  fragment A transaction code is</p>
  
  <pre><code>FragmentTransaction ft = getFragmentManager().beginTransaction();
  ft.hide(this);
  ft.add(R.id.front_side_container , detail);
  ft.addToBackStack(null);
  ft.commit();
  </code></pre>
  
  <p>in fragment A code, <code>ft.hid(this)</code> &lt;- I hide fragment A</p>
  
  <p>code in fragment B</p>
  
  <pre><code>getFragmentManager().popBackStack();
  </code></pre>
  
  <p>when call <code>popBackStack()</code>, I don't call <code>FrangmentTransaction.show()</code></p>
  
  <p>but fragment A appear. why? I don't call <code>show()</code></p>
  
  <p>is correct automatically called <code>show()</code> when execute <code>popBackStack()</code>?</p>