     //
     //--------------------------------------------------------------------------
 
-    /**
-     *  @private
-     */
-    override protected function initializeAccessibility():void
-    {
-        if (RadioButton.createAccessibilityImplementation != null)
-            RadioButton.createAccessibilityImplementation(this);
-    }
-
-
     //----------------------------------
     //  enabled
     //----------------------------------

            addToGroup();

        var g:RadioButtonGroup = group;
        if (g.selection != this)
            g.setSelection(this);
    }

    //--------------------------------------------------------------------------
    //
    //  Overridden functions: UIComponent
    //
    //--------------------------------------------------------------------------

    /**
     *  @private
     */
    override protected function updateDisplayList(unscaledWidth:Number,
                                                  unscaledHeight:Number):void
    {
        super.updateDisplayList(unscaledWidth, unscaledHeight);

        // If this rb is selected and in a group, make sure it is the group
        // selection.  If it is not selected and it's in a group, make sure it
        // is not the group selection.
        if (group)
        {
            if (selected)
                _group.selection = this;
            else if (group.selection == this)
                _group.selection = null;   
        }
    }
    
    //--------------------------------------------------------------------------
    //
    //  Overridden event handlers: UIComponent

    //  Properties
    //
    //--------------------------------------------------------------------------

    //----------------------------------
    //  autoGroupIndex
    //----------------------------------

    /**
     *  @private
     *  automaticRadioButtonGroups is shared with halo radio button groups.
     *  Spark radio button groups are prefixed with _fx to differentiate the
     *  Halo groups which are stored in the same table.
     */
    private function get autoGroupIndex():String
    {
        return "_spark_" + groupName;
    }

    //----------------------------------
    //  group
