title: Call controller's function from another controller / Share data between controllers
body: <p>For the moment, when I'm in a controller and that I want to call a function from another controller, I do this :</p>
  
  <pre><code>App.app.getControllerInstances()['App.controller.OtherController'].do_something();
  </code></pre>
  
  <p>Is seems a bit heavy to me, is there another (better) way to do this ?</p>
  
  <p>Thanks</p>