stopListening to Mojo.Event

I have several event listeners in a webOS app and each one I set up like this:

this.controller.listen(
    'a开发者_开发知识库Widget', 
    Mojo.Event.widgetEvent, 
    this.respondToWidgetEvent.bindAsEventListener(this)
);

And to stop listening I write code like this:

this.controller.stopListening(
    'aWidget', 
    Mojo.Event.widgetEvent, 
    this.respondToWidgetEvent.bindAsEventListener(this)
);

However, I realize now that my listeners may not be stopping. When I call bindAsEventListener on a function, do I get back the same object each time? If not, does stopListening make sure to remove the appropriate listener anyway?

If I remember correctly each call to bindAsEventListener() returns a new instance. Prevent that action by calling it once and setting a var:

bindToWidget = this.respondToWidgetEvent.bindAsEventListener(this);

this.controller.listen(
    'aWidget', 
    Mojo.Event.widgetEvent, 
    bindToWidget
);

this.controller.stopListening(
    'aWidget', 
    Mojo.Event.widgetEvent, 
    bindToWidget
);