title: React-Navigation with Login Screen
body: <p>I am trying to use react-navigation to create an initial LOGIN screen that has no tabbar and header, and once the user has been successfully authenticated will navigate to another screen called LISTRECORD which has a  tabbar, header and no back button option. Anyone has experience in this and can share?</p>
  <p>In summary, what I'm trying to achieve with react-navigation is described below...</p>
  <p>Screen 1: Login Screen (No Header &amp; Tabbar)<br />
  Authenticated...<br />
  Screen 2: LISTRECORD (Header, Tabbar and No Back Button)<br />
  The tabbar contains other tabs too for navigation to Screen 3, Screen 4...</p>