title: findViewById for MenuItem returns null
body: <p>This is my xml file for the ActionBar menu.</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/fav_button"
              android:title="Favourite"
              android:icon="@drawable/unstar"
              android:showAsAction="always|withText" /&gt;
  &lt;/menu&gt;
  </code></pre>
  
  <p>In my <code>onCreate</code> function, <strong>after</strong> calling <code>setContentView</code>. I do <code>favButton = (MenuItem) this.findViewById(R.id.fav_button);</code> But this returns null.</p>
  
  <p>But returns the proper object on the <code>onOptionsItemSelected</code> function.</p>
  
  <p>I'm using ActionBarSherlock, if that would make a difference.</p>
  
  <p>I have tried various options suggested by other findViewById returns null questions, but they haven't solved my issue.</p>