));
final PushButton addButton = new PushButton("Add...");
addButton.setTitle("Allows to add a working ontology");
DOM.setElementAttribute(addButton.getElement(), "id", "my-button-id");
addButton.addClickListener(new ClickListener() {
public void onClick(Widget sender) {
int x = addButton.getAbsoluteLeft();
int y = addButton.getAbsoluteTop();
addVocabulary(x, y + 20);
}