How customize the tooltip?

[DanielFrontD]

I wonder if there is a simple way to customize the tooltip, without modify the code of the plugin

[mauleyzaola]

It is clearly written in the demo

    $scope.eventRender = function( event, element, view ) {
      element.attr({'tooltip': event.title,
        'tooltip-append-to-body': true});
      $compile(element)($scope);
    };