private void AISClick(object sender, RoutedEventArgs e)
 {
     if (aisp == null)
     {
         AISPage p = new AISPage();
         aisp = p;
     }
     content.Content = aisp;
     CurrentControl  = content;
 }
        private void AISClick(object sender, RoutedEventArgs e)
        {
            AISPage p = new AISPage();

            content.Content = p;
        }