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    <p>Not sure about flex 4 as i mostly work in flex 3 but the set up should be close.<br/> Basically, let the render handle the rendering.<br/></p> <p>Your list should look something like this. </p> <p>There are 3 very important overrides you can do that will control the way a renderer can react to data.<br/> 1) set data is for when new data is assigned<br/> 2) createChildren will allow you to dynamically create children. I believe this is the function you are looking for in conjunction with set data<br/> 3) commitProperties this is where you do you assigning data to the children that are hard coded like my label example or the dynamically created children.<br/> <br/> What I have done in the past is similar.<br/> I test the data agains the current layout if it isn't the correct layout I rebuild it.<br/> So in set data method I test if layout is wrong I call createChildren().<br/> I suppose you could test the data structure on the old data before calling super.data in set data, but I didn't have good results like that.<br/></p> <p>myRenderer.mxml</p> <pre><code>&lt;mx:VBox xmlns:mx="http://www.adobe.com/2006/mxml" &gt; &lt;mx:Script&gt; &lt;![CDATA[ override public function set data(val:Object):void{ super.data = val; if( !val ){ return; } // test data here if current layout is wrong rebuild it by calling createchildren } override protected function createChildren():void{ super.createChildren() if( this.data == null ){ return; } // create your data driven layout here } override protected function commitProperties():void{ super.commitProperties(); if ( data == null ){ return; } } ]]&gt; &lt;/mx:Script&gt; &lt;mx:Label id="myLabel" text="{data.someLabelVar} /&gt; &lt;/mx:VBox&gt; </code></pre>
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    1. COI was thinking about doing this. Technically this wouldn't be too hard if I used multiple states. However my item renderes are pretty complex, written in actionscript, and uses custom layout... whole reason I went with AS item renderer is to make it light and i think adding all that logic into the item renderer would negate the benefit..
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    2. COyou use your item renderer to create your classes(ItemRendererOne and ItemRendererTwo) and add them as children to the renderer :) Its easier then you think you already have half the work done. Oh yeah and no need for states.
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    3. COhmm interesting.. that would work... but it does introduce another layer of UIComponent. Also that way, each item renderer will have all of my custom renderers which seems redundant.
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