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Control DataGroup width

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" xmlns:s="library://ns.adobe.com/flex/spark">     <mx:String id="txt">this is a test.</mx:String>     <mx:HSlider id="slider" minimum="100" maximum="400" value="250" />     <s:DataGroup width="{slider.value}" itemRenderer="spark.skins.spark.DefaultItemRenderer">         <s:layout>             <s:TileLayout orientation="rows" />         </s:layout>         <s:dataProvider>             <mx:ArrayCollection source="{txt.split(' ')}" />         </s:dataProvider>     </s:DataGroup> </mx:Application>