Adding Button to Task

I’m adding buttons to my Taskline like this:

tools: “

and

gantt.config.columns = [
{name:“title”, label:“Produktion”, tree:true, width:’*’ },
{name:“tools”, label:“Tools”, tree:false, width:‘40’ }
];

This basically works fine, but after changing a Task via Pop-up, I can’t click the Button any more.

I tried two ways:

jQuery(’.button_set_ok’).click(function(e){
reacts as described.

jQuery(‘html,body’).on(‘click’, ‘.button_set_ok’, function(e) {
also works after changing, but here I need to select the task before I’m able to click the button.
So I need twi clicks…

Any advice?

Thanks a lot
Martin