title: titanium - get the current window
body: <p>I'd like to be able to show an error message (or maybe even a success message!) to the user. However, this would be for an asynchronous event - so it is presumably possible for the user to have jumped to another page in-between the sending for the event and the response.</p>
  
  <p>Given that that is the case, and given that i use a tabgroup as the "base" in the initial app.xml, how am i meant to access the current window? Ti.UI.getCurrentWindow() doesn't do anything on my system - no error, no nothing. </p>
  
  <p>I'm using the Titanium 3 api.</p>