title: Flutter change main appbar title on other pages
body: <p>Looking for some assistance with changing the AppBar <code>title</code> on subsequent pages, so me being tabs and some not.  <code>MyApp</code> is defined on the authentication page of my app.  I then goto a new page that holds the tabs, then I have other pages off some of the tab pages, what I want to be able to do is, instead of putting another <code>AppBar</code> under the main one, I just want to change the <code>title</code> of the main <code>AppBar</code> when I am on any of the other pages.</p>
  
  <p>Any ideas how to do this, I saw 1 example that did not fit because my tabs are setup different and could not make it fit, thought maybe there was a way to define the title initially so that I can change state or something and change the title.</p>
  
  <p>Any ideas or thoughts on this?</p>