private void UpdateKlant()
 {
     //TODO: Functioneel maken
     _editCustomerWindow       = new EditCustomerWindow();
     _editCustomerWindow.Owner = Application.Current.MainWindow;
     _editCustomerWindow.Show();
 }
        private void Edit()
        {
            if (EditWindow == null)
            {
                EditWindow = new EditCustomerWindow(selecItem);
                EditWindow.EditCustomerViewModel.PersonelEdit += EditCustomerViewModelSaved;
                EditWindow.Closing += EditCustomerWindowClosing;
                EditWindow.Show();
            }

            else
            {
                EditWindow.Focus();
            }
        }