private boolean closeAddressBook() {
    if (isModified) {
      // ask user if they want to save current address book
      MessageBox box = new MessageBox(shell, SWT.ICON_WARNING | SWT.YES | SWT.NO | SWT.CANCEL);
      box.setText(shell.getText());
      box.setMessage(resAddressBook.getString("Close_save"));

      int choice = box.open();
      if (choice == SWT.CANCEL) {
        return false;
      } else if (choice == SWT.YES) {
        if (!save()) return false;
      }
    }

    TableItem[] items = table.getItems();
    for (int i = 0; i < items.length; i++) {
      items[i].dispose();
    }

    return true;
  }