TouchEndHandler not firing on ios or android browsers?

[mark]

Hi,

I have a few touch handlers registered on a canvas:

    Canvas canvas = ...;

    canvas.addTouchStartHandler(new TouchStartHandler() {

        @Override

        public void onTouchStart(TouchStartEvent event) {

             // works fine

        }

    });

    canvas.addTouchEndHandler(new TouchEndHandler() {

        @Override

         public void onTouchEnd(TouchEndEvent event) {

             // never fires?  <---

         }

    });

Do I need to do something special to get the onTouchEnd() event to fire?

Thanks