public NewTaskWindowView(int projectId)
 {
     InitializeComponent();
     Title       = "Dodanie nowego zadania";
     DataContext = new NewTaskWindowViewModel(projectId)
     {
         Close = () => Close()
     };
 }
 public NewTaskWindowView(Task task)
 {
     InitializeComponent();
     Title       = "Edycja zadania";
     DataContext = new NewTaskWindowViewModel(task)
     {
         Close = () => Close()
     };
 }