flex list默认拖拽中加入数据

???protected function list_dragStartHandler(event:DragEvent):void
???{
????if (event.isDefaultPrevented())
?????return;
????var appVO:AppWindowVO? = list.selectedItem as AppWindowVO;
????var dragSource:DragSource = new DragSource();
????
????dragSource.addData(appVO,"paramsObj");??
????list.addDragData(dragSource);
????DragManager.doDrag(this,
?????dragSource,
?????event,
?????list.createDragIndicator(),
?????0 /*xOffset*/,
?????0 /*yOffset*/,
?????0.5 /*imageAlpha*/,
?????list.dragMoveEnabled);
????
???}

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<s:List id="list"? dragStart="list_dragStartHandler(event)"
??? dragEnabled="true"?