      *  @param index The index of the  control in the
      *  RadioButtonGroup control, where the index of the first control is 0.
      *
-     *  @return The specified RadioButton control if index between
-     *  0 and numRadioButtons, otherwise null.
+     *  @return The specified RadioButton control if index is between
+     *  0 and the value of <code>numRadioButtons</code>, otherwise, <code>null</code>.
      * 
      *  @see numRadioButtons
      *  

 *  /&gt;
 *  </pre>
 *
 *  @see mx.components.RadioButton
 *  
 *  @langversion 3.0
 *  @playerversion Flash 10

 *
 *  @mxml
 *
 *  <p>The <code>&lt;s:Group&gt;</code> tag inherits all of the
 *  tag attributes of its superclass, and adds the following tag attributes:</p>
 *
 *  <pre>
 *  &lt;s:RadioButtonGroup
 *    <strong>Properties</strong>
 *    enabled="true"
 *    selectedValue="null"
 *    selection="null"
 *
 *    <strong>Events</strong>
 *    change="<i>No default</i>"
