/** Show a progress loader. */
public static void showProgress(boolean isShow) {
if (isShow) {
div.setStyleName("valign-wrapper progress-wrapper");
progress.getElement().getStyle().setProperty("margin", "auto");
div.add(progress);
RootPanel.get().add(div);
} else {
div.removeFromParent();
progress.removeFromParent();
}
}
