title: Re-render navigation bar after login on vuejs
body: <p>Im trying to create a client login with vue, I have the main component and nested are the navigation bar and the component that renders the content
  On the creation of the navigation component  I check if the user is logged to show the buttons for guests and hide the buttons for the protected sections
  My problem is after I submit the login on my login component I don't know how to trigger the re-rederization of my navigation bar component to show the right buttons</p>
  
  <p>I don't know if I should have a global variable on my main component  or should I have to find a way to emit an event from the child to the father and the emit another from the main component to the navigation bar or maybe is more simple but I don't have idea</p>
  
  <p>If you need more information just let me know
  Thanks in advance</p>