public function insertItem($item,$position=0){
		$itemO=$this->beforeAddItem($item);
		 $start = array_slice($this->items, 0, $position);
		 $end = array_slice($this->items, $position);
		 $start[] = $item;
		 $this->items=array_merge($start, $end);
		 return $itemO;
	}