Element blockingDiv = blockingDivs.get(blockingDivs.size() - 1);
blockingDiv.getStyle().setProperty("display", "none");
}
Element body = RootPanel.getBodyElement();
ScreenBlocker screenBlocker = new ScreenBlocker(blockingDivStyleName);
blockingDivs.add(screenBlocker.getElement());
body.appendChild(screenBlocker.getElement());
}