title: how to open authentification popup or modal in Angular 2
body: <p>I am trying to code a <strong>login component</strong> for my application in <strong>Angular 2</strong> version rc-1. But I did not find <strong>how to open my modal</strong> without a button action.</p>
  
  <p>When I load my app, I check if the user is logged or not (with the localStorage) : if he is not logged the login modal had to be openned. </p>
  
  <p>So open/close modal <strong>is conditionned by a boolean parameter</strong> and not a action button.</p>
  
  <p>Do you know how can I open a login modal without a button action ?</p>
  
  <p>Thanks in advance,</p>