title: Option Menu does not appear in Android
body: <p>I have this code to create the menu:</p>
  
  <pre><code>@Override
  public boolean onCreateOptionsMenu(Menu menu) {
          super.onCreateOptionsMenu(menu);
      MenuInflater inflater = getMenuInflater();
      inflater.inflate(R.menu.tip_menu, menu);
      return true;
  
  }
  
  
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
  
      switch (item.getItemId()) {
      case MNU_PREV:
          animateTextViewsPrev();
          break;
  
      case MNU_NEXT:
          animateTextViewsNext();
          break;
      }
  
      return true;
  }
  </code></pre>
  
  <p>And the XML:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
      &lt;menu xmlns:android="http://schemas.android.com/apk/res/android" &gt;
          &lt;item android:id="@+id/prev_tip" android:title="@string/prevTip"&gt;&lt;/item&gt;
          &lt;item android:id="@+id/next_tip" android:title="@string/nextTip"&gt;&lt;/item&gt;
      &lt;/menu&gt;
  </code></pre>
  
  <p>In a smartphone with Android 2.1 the menu is visible but in other mobile whit 4.1.1 is invisible.
  Somebody now how to solve it?</p>