title: How do I find what ?android:attr/listChoiceIndicatorSingle points to?
body: <p>I have </p>
  
  <pre><code>android:button="?android:attr/listChoiceIndicatorSingle"
  </code></pre>
  
  <p>on the layout for a CheckBox. I pressed F3 to take me to the definition, and it just said</p>
  
  <pre><code>    &lt;!-- Drawable to use for single choice indicators. --&gt;
      &lt;attr name="listChoiceIndicatorSingle" format="reference" /&gt;
  </code></pre>
  
  <p>in <code>android-sdk/platforms/android-17/data/res/values/attrs.xml</code>. I searched the whole file and that was the only occurrence. </p>
  
  <p>How do I find the drawables that it references? </p>