title: Calling setCompoundDrawables() doesn't display the Compound Drawable
body: <p>After I call the <a href="http://developer.android.com/reference/android/widget/TextView.html#setCompoundDrawables%28android.graphics.drawable.Drawable,%20android.graphics.drawable.Drawable,%20android.graphics.drawable.Drawable,%20android.graphics.drawable.Drawable%29"><code>setCompoundDrawables</code></a> method, the compound Drawable is not shown..</p>
  
  <pre><code>Drawable myDrawable = getResources().getDrawable(R.drawable.btn);
  btn.setCompoundDrawables(myDrawable, null, null, null);
  </code></pre>
  
  <p>Any thoughts?</p>