How to remove event listeners correctly in this function

public function doAddItem(itemConcepto:int):void{
                modalCfd = new modalCFDItems();
                modalCfd.addEventListener(Event.CLOSE, closeHandler);
                modalCfd.addEventListener("addItemResult", addItem_resultHandler);
                modalCfd.addEventListener("addItemResize", addItemResize_resultHandler);                
                PopUpManager.addPopUp(modalCfd, this, true)
                PopUpManager.centerPopUp(modalCfd);
            }
            private function addItem_resultHandler(event:Event):void{   
                addItemStuff();
                PopUpManager.removePopUp(modalCfd);
                removeListeners("modalCfd");
            }
            private function closeHandler(event:CloseEvent):void{
                PopUpManager.removePopUp(modalCfd);
                removeListeners("modalCfd");
            }
            public function removeListeners(listener:String):void{
                if(listener == "modalCfd"){
                    modalCfd.removeEventListener("addItemResult", addItem_resultHandler);
                    modalCfd.removeEventListener("addItemResize", addItemResize_resultHandler);
                    modalCfd.开发者_StackOverflowremoveEventListener(Event.CLOSE , closeHandler);
                }
            }

As you can see I'm a newbie with good practices (in pretty much anything) How can I remove the event listeners correctly? That's a Pop Up I'm handling there. Sorry if that function doesn't make much sense, I simplified it to fit stackoverflow.

You already have a reference to your object so just use that in your removelisteners function.

public function doAddItem(itemConcepto:int):void{
                modalCfd = new modalCFDItems();
                modalCfd.addEventListener(Event.CLOSE, closeHandler);
                modalCfd.addEventListener("addItemResult", addItem_resultHandler);
                modalCfd.addEventListener("addItemResize", addItemResize_resultHandler);                
                PopUpManager.addPopUp(modalCfd, this, true)
                PopUpManager.centerPopUp(modalCfd);
            }
            private function addItem_resultHandler(event:Event):void{   
                addItemStuff();
                PopUpManager.removePopUp(modalCfd);
                removeListeners();
            }
            private function closeHandler(event:CloseEvent):void{
                PopUpManager.removePopUp(modalCfd);
                removeListeners();
            }
            public function removeListeners():void{
                modalCfd.removeEventListener("addItemResult", addItem_resultHandler);
                modalCfd.removeEventListener("addItemResize", addItemResize_resultHandler);
                modalCfd.removeEventListener(Event.CLOSE , closeHandler);
            }