private void PopulateTasksList(Task[] activeTasks)
 {
     this.LibrarianTasks_List.Children.Clear();
     foreach (Task task in activeTasks)
     {
         LibrarianListItem listItem = new LibrarianListItem(task, this, this.parentWindow.Data);
         this.LibrarianTasks_List.Children.Add(listItem);
     }
 }
 //default constructor
 public AskForISBNWindow(LibrarianListItem parent)
 {
     InitializeComponent();
     this.parentListItem = parent;
 }