 
     //--------------------------------------------------------------------------
     //
+    //  Class mixins
+    //
+    //--------------------------------------------------------------------------
+
+    /**
+     *  @private
+     *  Placeholder for mixin by ListBaseAccImpl.
+     */
+    mx_internal static var createAccessibilityImplementation:Function;
+
+    //--------------------------------------------------------------------------
+    //
     //  Constants
     //
     //--------------------------------------------------------------------------

    //  Overridden properties: UIComponent
    //
    //--------------------------------------------------------------------------

    //----------------------------------
    //  baselinePosition

 *  @productversion Flex 4
 */
[Event(name="caretChange", type="spark.events.IndexChangeEvent")]

[AccessibilityClass(implementation="mx.accessibility.ListBaseAccImpl")]

/**
 *  The ListBase class is the base class for all components that support
