m item: The item to be stored.
            @param index: The index of the item to replace.
            @return The element previously at the specified position.
        */
        public function setItem(item:*, index:int):* {
            return this._collection.splice(index, 1, item)[0];
        }
        
        /**
            Returns an Array containing all of the elements in the list in order.
            
            @return Returns an Array containing all of the elements in the list in order.
      