title: ProgressBar won't be in Holo style
body: <p>I added a <code>ProgressBar</code> to my UI by using the ADT's visual editor. For some reason, the <code>ProgressBar</code> is not in Holo style used by my <code>Activity</code>, it's just a grey line thought it is supposed to be in Holo style. As you can see below, I didn't touch any <code>ProgressBar</code>'s attributes in Activity's style:</p>
  
  <pre><code>     &lt;style name="sMain" parent="@android:style/Theme.Holo"&gt;
      &lt;item name="android:actionBarStyle"&gt;@style/mTabAreaBackground&lt;/item&gt;
      &lt;item name="android:actionBarTabStyle"&gt;@style/ActionBarTabStyle&lt;/item&gt;
  &lt;/style&gt;
  </code></pre>
  
  <p>The Bar's XML:</p>
  
  <pre><code>      &lt;ProgressBar
      android:id="@+id/pbMyBar"
      style="?android:attr/progressBarStyleHorizontal"
      android:layout_width="match_parent"
      android:layout_height="wrap_content"
      android:layout_below="@+id/relativeLayout1"
      android:layout_marginLeft="10dp"
      android:layout_marginRight="10dp" /&gt;
  </code></pre>
  
  <p>Any explanation for this strange behavior?</p>