How do I Removie an EventListeners after a button has been pressed?

1

I’m trying to remove an EventListener after I click on a button. The thing is that I have the AS calling a movieclip, which is calling a box to appear on the stage.
The code that I have works, but if you keep clicking on that same button more than once more boxes keep appearing one on top of the other one, so what i need is to remove the listener when you click on the button ones, but if i click on a different button to activate the listener again so that i can click on that same button again and make the box appear. so here’s what i got so far:

function Main() {

// Adding mouse event to our stage!
b1.addEventListener(MouseEvent.CLICK, AddBox);

}
Main();

function AddBox(e:MouseEvent):void {

// Adding a box to the stage
var newBox:AbUsbox = new AbUsbox();
this.addChild(newBox);

// Setting the box’s X and Y position
newBox.x = 883.15;
newBox.y = 420.75;

// Setting the box’s scale and alpha
newBox.scaleX = 1;
newBox.scaleY = 1;
newBox.alpha = 1;
}