Changing/toggling classes in timeline items

[erevodifosin]

Hello,

I was trying to change/toggle some classes on the timeline items in the runtime in order to upgrade the UX but it is a bit weird the way I managed to achieve it.
First of all in some items I use "className": "cancelled" which adds the corresponding class in the element.
The task is to toggle the specific class in the selected item. I was not able to find something related in the documentation.

I tried the below with a bit of success but then when I click somewhere else the toggle is reverted.

temp = document.getElementsByClass("vis-selected")
temp[0].classList.toggle("cancelled");

The workaround I managed to figure out was to remove the class name in my db and then reload the items of the timeline.
Am I missing something here or my workaround is the only solution for the moment?
It would be nice to have a method to toggle a class in the items in runtime.