      *  Returns the  control at the specified index.
      *
      *  @param index The index of the  control in the
-     *  FxRadioButtonGroup control, where the index of the first control is 0.
-     *
-     *  @return The specified FxRadioButton control if index between
+     *  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


    /**
     *  @private
     *  Sandbox root of FxRadioButton "a" in breadthOrderCompare().
     */
    private var aSbRoot:DisplayObject;
    
    /**
     *  @private
     *  Sandbox root of FxRadioButton "b" in breadthOrderCompare().
     */
    private var bSbRoot:DisplayObject;


//  Other metadata
//--------------------------------------

[IconFile("RadioButtonGroup.png")]

/**
 *  The RadioButtonGroup control defines a group of RadioButton controls
 *  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
 *  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>
 *
