  *  that act as a single mutually exclusive control; therefore,
  *  a user can select only one  control at a time.
  *  The <code>id</code> property is required when you use the
- *  <code>&lt;mx:RadioButtonGroup&gt;</code> tag to define the name
+ *  <code>&lt;s:RadioButtonGroup&gt;</code> tag to define the name
  *  of the group.
  *
  *  <p>Notice that the RadioButtonGroup control is a subclass of EventDispatcher,

     *  @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.
     * 
     *  @see numRadioButtons
     *  

 *
 *  @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>"
