List ItemRenderer and Drag Drop

I use Item Renderer in List control. But when drag started I get error: TypeError: Error #1009: Cannot access a property or method of a null object reference. at MemberRenderer/set data() etc.

Can anybody help me? My ItemRenderer:

   <?xml version="1.0" encoding="utf-8"?>
<mx:HBox xmlns:mx="http://www.adobe.com/2006/mxml" width="100%" horizontalScrollPolicy="off" height="19" verticalAlign="middle" horizontalGap="4">
    <mx:Script>
        <![CDATA[
            import vos.Person;
   import assets.Icons;

   private var person:Person;
   private var _data:Object;


   override public function set data(value:Object):void
   {
                person = value as Person;
    _data = value ;
                if (data != null)
    {
     fullName.htmlText = person.current ? "<b>" + person.fullName + "</b>" : person.fullName
     role.source = person.role == Person.ROLE_LEADER ? Icons.leader : Icons.user;
     cameraImage.source = person.camera == true ? Icons.video : null;
     micImage.source = person.mic == true ? Icons.speak : null ;  
                }
            }

            override public function get data():Object
   {
                   return _data ;
            }   

        ]]>
    </mx:Script>
 <mx:Image id="role" />
 <mx:Label id="fullName" width="100%" />
 <mx:Image id="cameraImage" />
 <mx:Image id="micImage" />
</mx:HBox>

ansaurus

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List ItemRenderer and Drag Drop

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