code: function(item) {
              var hasFiltered = item.$el.hasClass("hr-list-fiter-on");
              var state = !(this._filter != null && !this._filter(item.model, item));
              item.$el.toggleClass("hr-list-fiter-on", !state);
  
              if (hasFiltered == state) this.trigger("filter", item, state);
              return state;
          }
docs: /*
  Apply filter on a item