Ember.js dynamic views

I have two Models Admin and User My application template is as follow

//application.hbs :

{{outlet}}
{{header-nav}}

What I want to do (if it is possible) to make {{header-nav}} customizable, I explain : If the admin authenticate I want to render the component {{admin-header}} in the case the user authenticate it should render {{user-admin}}. How can I build what to render in application.hbs dynamically ?