/// <summary>
/// Handles the Click event of the Logout control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="RoutedEventArgs"/> instance containing the event data.</param>
private async void Logout_Click(object sender, RoutedEventArgs e)
{
MessageDialog dialog = new MessageDialog("The application will exit.\nAre you sure you want to log out?", "Log out");
dialog.Commands.Clear();
dialog.Commands.Add(new UICommand("Yes", (s) =>
{
OAuthToken.Delete();
App.Exit();
}));
dialog.Commands.Add(new UICommand("Cancel"));
dialog.DefaultCommandIndex = 1;
dialog.CancelCommandIndex = 1;
await dialog.ShowAsync();
}