title: Seekbar in Options Menu
body: <p>I'm trying to add a seekbar item to my options menu, but all I get is a panel with my title for the text. In my main activity I'm doing this:</p>
  <pre class="lang-java prettyprint-override"><code>@Override
  public boolean onCreateOptionsMenu(Menu menu)
  {
      getSupportMenuInflater().inflate(R.menu.activity_main, menu);
      return true;
  }
  </code></pre>
  <p>And here is my <code>activity_main.xml</code>:</p>
  <pre class="lang-xml prettyprint-override"><code>&lt;menu xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot; &gt;
  
  &lt;item
      android:id=&quot;@+id/transparency_seekbar&quot;
      android:showAsAction=&quot;never&quot;
      android:title=&quot;test&quot;
      android:actionViewClass=&quot;android.widget.SeekBar&quot;/&gt;
  
  &lt;/menu&gt;
  </code></pre>