Repeater control creates all the objects whether or not they are initially visible

        

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    <!-- optimize/VBoxRepeater.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:mx="library://ns.adobe.com/flex/mx" xmlns:s="library://ns.adobe.com/flex/spark">
    <fx:Script> 
        import mx.collections.ArrayCollection; 
        [Bindable] 
        public var imgList:ArrayCollection = new ArrayCollection([ 
            {img:"a.gif"}, 
            {img:"a.gif"}, 
            {img:"a.gif"} 
        ]); 
      </fx:Script>
    <mx:Panel title="VBox with Repeater">
        <mx:VBox height="150" width="250">
            <mx:Repeater id="r" dataProvider="{imgList}">
                <mx:Image source="../assets/{r.currentItem.img}" />
            </mx:Repeater>
        </mx:VBox>
    </mx:Panel>
</s:Application>

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Repeater control creates all the objects whether or not they are initially visible : Repeater « Components « Flex

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