How to use waypoint.js along with handlebars.js?

Question

JavaScript

Hi all! Has anyone tried to get waypointJS to work correctly after content is loaded via handlebarsJS ? i.e. we apply waypointJS to elements that are loaded via handlebarsJS. ,
the waypoint.js script needs to be run after it has loaded our handlebars.js content.
I know that the solution may be in handlebars Helpers but I don't quite understand how to use it.

I tried like this:

$.ajax({
            url:'items_site.json',
            type: "POST",
            cache: false,
            dataType: "JSON",
            statusCode: {
                404: function () {
                    $(sites).append("<span class='item_404'>Oops items not found on server. ERRoR CODE 4o4!</span>");
                }
            }
        }).done(function(items_site){
            //RUN Handlebars
            var thumb = Handlebars.compile($('#items_site').html()),
                modal = Handlebars.compile($('#modals').html());
            $(sites).append(thumb(items_site));
            $(modals).append(modal(items_site));

            //amimate modal
            some_functions(); //эта функция запускается событиях применяемые к нашим элементов после того как потрудились, в нашем случае это waypoint.js
        })
    });

//but it doesn't work(
PS I'm still learning, help me figure it out please.