tourdeflexmodules/src/mx/effects/DefaultListEffectExample.mxml

<?xml version="1.0"?>
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  Licensed to the Apache Software Foundation (ASF) under one or more
      contributor license agreements.  See the NOTICE file distributed with
      this work for additional information regarding copyright ownership.
      The ASF licenses this file to You under the Apache License, Version 2.0
      (the "License"); you may not use this file except in compliance with
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          http://www.apache.org/licenses/LICENSE-2.0

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      distributed under the License is distributed on an "AS IS" BASIS,
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<mx:Module xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:mx="library://ns.adobe.com/flex/mx"
				paddingBottom="0" paddingTop="0" paddingLeft="0" paddingRight="0"
				height="100%" width="100%">

     <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>

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

    <mx:Panel title="DefaultListEffect Example"
				paddingBottom="10" paddingTop="10" paddingLeft="10" paddingRight="10"
				height="100%" width="100%">

        <mx:List id="list0" 
            width="150"
            dataProvider="{myDP}" 
            variableRowHeight="true" 
            fontSize="18" 
            allowMultipleSelection="true" 
            itemsChangeEffect="{myDLE}"/>
    
        <mx:Button 
            label="Delete item" 
            click="deleteItem()"/>
        <mx:Button 
            label="Add item" 
            click="addItem()"/>

    </mx:Panel> 
</mx:Module>