public SzczegolyZadaniaWindow()
 {
     db = TaskDbContext.GetInstance;
     InitializeComponent();
 }
 public AddCategoryWindow()
 {
     InitializeComponent();
     db = TaskDbContext.GetInstance;
 }
 public DodajZadanieWindow()
 {
     db = TaskDbContext.GetInstance;
     InitializeComponent();
 }