<button {{action "close"}}>
  {{#link-to 'register'}}Registreer{{/link-to}}
</button>

// template.hbs

<button {{action "link" "register"}}>Registreer</button>

...

// template-controller.js
actions: {
  link: function(routeName) {
    this.transitionToRoute(routeName);
    this.close()
  }
}