public void NotifyCustomerEdited(Klant klant)
 {
     Customers.Remove(Customers.FirstOrDefault(k => k.Id == klant.Id));
     Customers.Add(new KlantVM(klant));
     _editCustomerWindow.Close();
     _editCustomerWindow = null;
 }
 private void EditCustomerViewModelSaved(object sender, EventArgs e)
 {
     EditWindow.Close();
 }