group.setVisible(visibleCheckBox.getValue());
final AsyncCallback<UserGroup> updateGroupCallback = new AsyncCallback<UserGroup>() {
public void onFailure(Throwable caught) {
MessageDialogBox dialog = new MessageDialogBox("Error", "Could not save group: " + caught.getMessage(), true, true, true);
dialog.center();
}
public void onSuccess(UserGroup group) {
if (group == null) {
MessageDialogBox dialog = new MessageDialogBox("Error", "Could not save group.", true, true, true);