flash - Flex Spark Link Bar Background Color/Alpha -

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i trying change background color , alpha of link bar in flex/flash 4 application. no matter properties define, background of said link bar white. please see image http://i.stack.imgur.com/pyhs2.png.

<mx:linkbar id="lnkbar" backgroundalpha="0" backgroundcolor="black" bottom="0" itemclick="lnkbar_itemclickhandler(event)">             <mx:dataprovider>                 <s:arraycollection>                     <fx:string>resource management</fx:string>                     <fx:string>standard reports</fx:string>                     <fx:string>clear selected state</fx:string>                 </s:arraycollection>             </mx:dataprovider>         </mx:linkbar>

instead of "backgroundalpha" or "backgroundcolor", use "contentbackgroundalpha" or "contentbackgroundcolor".


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