title: Make an NSToolbar's fullScreenAccessoryView visible at launch
body: <p>I am trying to make an application with a toolbar controller which view is shown, and for each view shown I want to include a second 'row' for the toolbar, and I found out that to do this you had to do <code>[toolbar setFullScreenAccessoryView:view]</code>.  However, the view does not appear until the user toggles fullscreen mode and the accessory view remains after toggling the window back to windowed mode.  I would like it to look like the following examples from Mail.app, Preview.app, Dictionary.app:
  <img src="https://i.stack.imgur.com/3KTWP.png" alt="enter image description here">
  <img src="https://i.stack.imgur.com/5Reml.png" alt="enter image description here">
  <img src="https://i.stack.imgur.com/j6gqN.png" alt="enter image description here"></p>