DefaultListEffect  - AS3 Flex

<?xml version="1.0"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/mx">

    <fx:Script>
        <![CDATA[
            import mx.effects.DefaultListEffect;
            import mx.collections.ArrayCollection;

            [Bindable]
            private var myDP:ArrayCollection = new ArrayCollection(
                ['A','B','C','D','E','F','G','H']);

            private function deleteItem():void {
                // As each item is removed, the index of the other items changes.
                // So first get the items to delete, then determine their indices
                // as you remove them.
                var toRemove:Array = [];
                for (var i:int = 0; i < list0.selectedItems.length; i++)
                    toRemove.push(list0.selectedItems[i]);
                for (i = 0; i < toRemove.length; i++)
                    myDP.removeItemAt(myDP.getItemIndex(toRemove[i]));
            }

            private var zcount:int = 0;
            private function addItem():void {
                // Always add the new item after the third item,
                // or after the last item if the length is less than 3.
                myDP.addItemAt("Z"+zcount++,Math.min(3,myDP.length));
            }
        ]]>
    </fx:Script>

    <!-- Define an instance of the DefaultListEffect effect,
         and set its fadeOutDuration and color properties. -->
    <fx:Declarations>
        <mx:DefaultListEffect id="myDLE"
            fadeOutDuration="1000"
            color="0x0000ff"/>
    </fx:Declarations>

    <s:Panel title="Halo DefaultListEffect Example" width="75%" height="75%" >
        <s:VGroup left="20" right="20" top="20" bottom="20">

            <mx:List id="list0"
                width="150"
                dataProvider="{myDP}"
                variableRowHeight="true"
                fontSize="18"
                allowMultipleSelection="true"
                itemsChangeEffect="{myDLE}"/>

            <s:Button
                label="Delete item"
                click="deleteItem();"/>
            <s:Button
                label="Add item"
                click="addItem();"/>
        </s:VGroup>

    </s:Panel>
</s:Application>