title: I can't set imageLevel
body: <p>I have ICS app with layout which use a ImageView with drawable list. I try to set imageLevel to it but pic doesn't change. </p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;layer-list xmlns:android="http://schemas.android.com/apk/res/android" &gt;
  
  &lt;item
      android:maxLevel="0"
      android:drawable="@drawable/main_activity_idle" /&gt;
  
  &lt;item
      android:maxLevel="1"
      android:drawable="@drawable/main_activity_upload" /&gt;
  
  &lt;item
      android:maxLevel="2"
      android:drawable="@drawable/main_activity_download" /&gt;
  &lt;/layer-list&gt;
  
  
   &lt;ImageView
      android:id="@+id/main_panel"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:paddingBottom="6dp"
      android:layout_below="@+id/main_panel_logo"
      android:layout_alignParentRight="true"
      android:src="@drawable/main__dr_list" /&gt;
  
  statusIndicator = (ImageView) findViewById(R.id.main_panel_activity);
      statusIndicator.setImageLevel(0);
  </code></pre>
  
  <p>Do you know why it happens?</p>