 return this.size == 0;
        }
        
        /**
            Finds the position of the last occurrence of a specified item.
            
            @param item: The element to search for.
            @param fromIndex: The position in the list from which to start searching for the item.
            @return Returns the index of the last occurrence, or <code>-1</code> if the element doesn't exist.
        */
        public function lastIndexOf(item:*, fromIndex:int = 0x7fffffff):int {
            return