private void cancelButton_Click(object sender, RoutedEventArgs e)
{
//NavigationService.Navigate(new Uri("/Welcome", UriKind.Relative));
Welcome welcome = new Welcome();
mainPage.ContentFrame.Content = welcome;
}
private void cmdContinue_Click(object sender, RoutedEventArgs e)
{
Welcome startpage = new Welcome(mainpage);
mainpage.ContentFrame.Content = startpage;
}