     //  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

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

[IconFile("RadioButton.png")]

[AccessibilityClass(implementation="spark.accessibility.RadioButtonAccImpl")]

/**
 *  The RadioButton component allows the user make a single choice

            addToGroup();

        var g:RadioButtonGroup = group;

        if (g.selection != this)
            g.setSelection(this);
    }

    //--------------------------------------------------------------------------
    //
    //  Overridden event handlers: UIComponent
