ToastPromt before or after Navigate on WP8

Mar 14, 2014 at 1:12 PM
When I use ToastPromt before I navigate to another XAML page, it seems like nothing happens, no ToastPromt gets activated. The code is run, but nothing happens on the screen. Code:
 Navigate(new Uri("/MainPage.xaml", UriKind.Relative));
                    text = ("Some sample text");
                    var toastPrompt =  new ToastPrompt
                         {
                                 Background = new SolidColorBrush(Colors.Green),
                                 MillisecondsUntilHidden = 5000,
                                 Title = "someTitle",
                                 TextOrientation = Orientation.Vertical,
                                    Message = text,
                                 };;
                    toastPrompt.Show();
But if I navigate to the same page, lets say I am on MainPage.xaml, the toast comes up just fine.

Is it any known issues between ToastPromt and Navigation?