private void RemoveDebtorButton_Click(object sender, RoutedEventArgs e)
 {
     if (debtorsListBox.SelectedItem != null)
     {
         try
         {
             debtorManager.RemoveDebtor((Debtor)debtorsListBox.SelectedItem);
             debtorManager.Save();
         }
         catch (Exception ex)
         {
             MessageBox.Show(ex.Message, "Chyba", MessageBoxButton.OK, MessageBoxImage.Error);
         }
     }
 }
        private void AddDebtorButton_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                debtorManager.AddDebtor(nameTextBox.Text, amountTextBox.Text, paidTextBox.Text);
                debtorManager.Save();

                nameTextBox.Clear();
                amountTextBox.Clear();
                paidTextBox.Clear();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Chyba", MessageBoxButton.OK, MessageBoxImage.Exclamation);
            }
        }
 private void DebtorManager_DebtorPropertyChanged(object sender, PropertyChangedEventArgs e)
 {
     debtorManager.Save();
 }