tc.setParent(tr);
final Textbox codeTb = new Textbox(materialCategory.getCode());
codeTb.setWidth("95%");
codeTb.setDisabled(materialCategory.isCodeAutogenerated());
codeTb.addEventListener("onChange", new EventListener() {
@Override
public void onEvent(Event event) {
final InputEvent ie = (InputEvent) event;
materialCategory.setCode(ie.getValue());
}