     //--------------------------------------------------------------------------
 
     /**
-     *  Implementation of the <code>IMXMLObject.initialized()</code> method 
+     *  Implementation of the <code>IMXMLObject.initialized()</code> method
      *  to support deferred instantiation.
      *
      *  @param document The MXML document that created this object.
      *
-     *  @param id The identifier used by document to refer to this object. 
+     *  @param id The identifier used by document to refer to this object.
      *  If the object is a deep property on document, <code>id</code> is null.
-     * 
+     *
      *  @see mx.core.IMXMLObject
      */
     public function initialized(document:Object, id:String):void


//--------------------------------------
//  Events
//-------------------------------------- 

/**
 *  Dispatched when the value of the selected RadioButton control in 
 *  this group changes.
 *
 *  @eventType flash.events.Event.CHANGE


/**
 *  The RadioButtonGroup control defines a group of RadioButton controls
 *  that act as a single mutually exclusive control; therefore,
 *  a user can select only one RadioButton 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
 *  of the group.
 *
 *  <p>Notice that the RadioButtonGroup control is a subclass of EventDispatcher, not UIComponent,
 *  and implements the IMXMLObject interface.
 *  All other Flex visual components are subclasses of UIComponent, which implements
 *  the IUIComponent interface.
 *  The RadioButtonGroup control has support built into the Flex compiler
 *  that allows you to use the RadioButtonGroup control as a child of a Flex container,
 *  even though it does not implement IUIComponent.
 *  All other container children must implement the IUIComponent interface.</p>
 *
 *  <p>Therefore, if you try to define a visual component as a subclass of
 *  EventDispatcher that implements the IMXMLObject interface,
 *  you will not be able to use it as the child of a container.</p>
 *
 *  @mxml
 *
 *  <p>The <code>&lt;mx:RadioButtonGroup&gt;</code> tag inherits all of the
 *  tag attributes of its superclass, and adds the following tag attributes:</p>
 *
 *  <pre>
 *  &lt;mx:RadioButtonGroup
 *    <strong>Properties</strong>
 *    enabled="true|false"
 *    id="<i>No default</i>"
 *    labelPlacement="right|left|top|bottom"
 *
 *    <strong>Events</strong>
 *    change="<i>No default</i>"
 *    itemClick="<i>No default</i>"
 *  /&gt;
 *  </pre>
 *
 *  @includeExample examples/RadioButtonGroupExample.mxml
 *
 *  @see mx.controls.RadioButton
 */
public class RadioButtonGroup extends EventDispatcher implements IMXMLObject
