title: Xamarin Forms navigating to a MasterDetail Page after a Content Page
body: <p>I'm creating an app using Xamarin Forms where when a user launches an app for the first time, they are sent to a login page.  Once they log in, they're redirected to the MasterPage, which is a MasterDetail Page.  However, when I try to navigate to the new MasterDetail Page, I only get the Detail Page, and the button to show the Master Portion is missing.  The only thing appearing on the app bar is the title I set.  I'm currently going to the MasterPage like this:</p>
  
  <pre><code>App.Current.MainPage = new NavigationPage(new MasterPage())
  {
       Title = "Welcome " + user.firstName
  };
  </code></pre>
  
  <p>Every other run, this isn't an issue, since when a user opens the app it automatically logs them in and goes right to the MasterPage, except during their first use. However, this is a very important issue for me since it happens the first time a user uses my app and it will be part of their first impression.  </p>