how to write events for formview inside header buttons? odoo 10

I have tried this code in odoo10 community but not working, what is my fault?

Or Can anyone guide me how to do it?

    openerp.module_name= function (instance) {

            var _t = instance.web._t, QWeb = instance.web.qweb;

                instance.web.FormView = instance.web.FormView.include({
                init: function() {
                        this._super.apply(this, arguments);
                        console.log("test"+this.getParent().dataset.model); 
                    },
                    events: {
                       'click #target': 'button_clicked',
                    },
                    button_clicked : function(ev) { 
                        console.log("test333555555");
                        ev.preventDefault();
                        ev.stopPropagation();
                        console.log("test 333333333333");
                    });         

                 },

            });
};