Override onDoubleClick to call internal method

[JokerMartini]

How can i call an internal method of the instance when overriding the 'onDoubleClick' event?

 panZoomObj = panzoom(this.sceneEl, {
          smoothScroll: false,
          zoomDoubleClickSpeed: 1,
          onDoubleClick: function(e) {
            panZoomObj.moveTo(0, 0);
            panZoomObj.zoomAbs(0, 0, 1);
            return false;
          }
      });