on = (collection == null) ? new Array() : collection.concat();
        }
        
        /**
            Appends the specified item to the end of this list.
            
            @param item: Element to be inserted.
            @return Returns <code>true</code> if the list was changed as a result of the call; otherwise <code>false</code>.
        */
        public function addItem(item:*):Boolean {
            this._collection.push(item);
            
            return true;
        }
        
        