public void Edit(object obj)
        {
            var repairDTO = SelectedItem as RepairDTO;

            if (repairDTO != null)
            {
                Window editRepairWindow = new ComputersAdd(repairDTO.ID);
                editRepairWindow.Show();
            }
        }
        public void Add(object obj)
        {
            Window addNewRepairWindow = new ComputersAdd();

            addNewRepairWindow.Show();
        }