VerticalPanel layout = new VerticalPanel();
layout.setStyleName("fill-layout-width");
ModelNode opDescription = description.get("operations").get("add").get("description");
ContentDescription text = new ContentDescription(opDescription.asString());
layout.add(text);
layout.add(form.asWidget());
WindowContentBuilder content = new WindowContentBuilder(layout, options);
window.trapWidget(content.build());
window.setGlassEnabled(true);
window.setWidth(480);