title: MBProgressHUD blocking user interaction
body: <p>My application has a <code>MBProgressHUD</code> on the screen while the <code>CLLocationManager</code> is getting the user current location at a separate thread in the background. Sometimes the location process start to take so long and obviously I would like to let the user decide to leave or not the screen. The problem is that the User Interface seems to be blocked by the <code>MBProgressHUD</code> so the user can't press the back button. </p>
  
  <p>Is there any implementation design to solve this problem? </p>