var MyBalloonContentLayout = ymaps.templateLayoutFactory.createClass(
    '<h3>$[properties.balloonContentHeader]</h3>' +
    '<div>$[properties.balloonContentBody]</div>' +
    '<div> <a href="#" id="more">Подробнее</a></div>', {
      build: function() {
        MyBalloonContentLayout.superclass.build.call(this);
        $('#more').bind('click', this.onMoreClick);
      },
      clear: function() {
        $('#more').unbind('click', this.onMoreClick);
        MyBalloonContentLayout.superclass.clear.call(this);
      },
      onMoreClick: function() {
        alert('УРА');
      }
    }
  );

  // Добавляю опцию для балуна
  objectManager.objects.options.set('balloonContentLayout', 'MyBalloonContentLayout');