code: function (e, obj) {
              obj.pageX = Event.getPageX(e);
              obj.pageY = Event.getPageY(e);
          }
docs: BEGIN BUILT-IN DOM EVENT HANDLERS // 
  The default event handler fired when the user moves the mouse while
  over the context element.
  @method onContextMouseMove
  @param {DOMEvent} e The current DOM event
  @param {Object} obj The object argument