Flex 3 Item renderer in List dissapear and shifted place

i added itemrenderer in list whenever scroll down bottom , scroll again. itemrenderer in list either gone or shifted places.

i have search on possible solution doesn't seen working. tried put datachange=”validatenow()” in itemrenderer doesn't work. read usevirtuallayout="false" seen list doesn't have usevirtuallayout ?

<mx:list 
        id="rowslist2" width="{vboxcall.width}" height="{ scheduleviewerheight }" 
        rowheight="{ scheduleviewer.rowheight }" 
        verticalscrollpolicy="off" verticalalign="middle"
         horizontalscrollpolicy="off"
        alternatingitemcolors="[0xeeeeee, 0xdfdfdf]" itemrenderer="rendererstate">
        <!-- example showcase item renderer -->
        <mx:dataprovider>
            <mx:object label="mr swabby" 
                       data="juneau" 
                       webpage="http://www.state.ak.us/"/>
            <mx:object label="mrs harrington" 
                       data="montgomery" 
                       webpage="http://www.alabama.gov/" /> 
        </mx:dataprovider>
    </mx:list>

before (picture) http://i.stack.imgur.com/vxoep.gif

after (picture) http://i.stack.imgur.com/3qho9.gif

any ideas ?

regards, mike

usevirtuallayout spark list.  issue sounds recycling problem.  see item renderer posts on blog.

 

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alex harui

flex sdk team

adobe systems, inc.

http://blogs.adobe.com/aharui

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