/// <summary>
 /// Executed when the Feedback Button is tapped from the Application bar. The app prepares the content and uses the default mail apps to give feedback.
 /// </summary>
 /// <param name="sender">Object Sender is a parameter called Sender that contains a reference to the control/object that raised the event.</param>
 /// <param name="e">RoutedEventArgs e is a parameter called e that contains the event data, see the RoutedEventArgs MSDN page for more information.</param>
 private void Feedback_Click(object sender, RoutedEventArgs e)
 {
     AppCommon.ComposeEmail();
 }