code>false</code>.
        */
        public function removeAllInstancesOfItem(item:*):Boolean {
            return ArrayUtil.removeItem(this._collection, item) != 0;
        }
        
        /**
            Removes the first occurance of the specified item in the list.
            
            @param item: Element to remove.
            @return Returns <code>true</code> if the list contained the item; otherwise <code>false</code>.
        */
        public function removeItem(item:*):Boolean {
          