 import mx.events.CollectionEvent;
 import mx.events.CollectionEventKind;
 import mx.events.ItemClickEvent;
-import spark.events.RendererExistenceEvent;
 import mx.managers.IFocusManagerComponent;
 
 [IconFile("ButtonBar.png")]

            if (renderer is IVisualElement)
                IVisualElement(renderer).owner = this; 
            if (renderer is IItemRenderer)
                IItemRenderer(renderer).allowDeselection = !requiresSelection;
        }
            
        if (isItemIndexSelected(index))

import flash.events.MouseEvent;
import flash.ui.Keyboard;

import spark.components.supportClasses.ListBase;
import spark.events.RendererExistenceEvent;

import mx.collections.IList;
import mx.core.EventPriority;
import mx.core.IFactory;
import mx.core.IVisualElement;
