private void BtnNext_Click(object sender, RoutedEventArgs e)
{
//GO TO THE NEXT NODE
TutorialNavigation.Next(tutorialLinkedList, BtnPrevious,
BtnNext, TxtTutorial, TutorialDialog);
}
private void BtnPrevious_Click(object sender, RoutedEventArgs e)
{
//GO TO THE PREVIOUS NODE
TutorialNavigation.Previous(tutorialLinkedList, BtnPrevious,
BtnNext, TxtTutorial);
}