combo.setNullSelectionAllowed(false);
combo.select(combo.getItemIds().iterator().next());
combo.setItemCaptionPropertyId(ValoThemeUI.CAPTION_PROPERTY);
combo.setItemIconPropertyId(ValoThemeUI.ICON_PROPERTY);
combo.setWidth("240px");
group.addComponent(combo);
Button today = new Button("Do It");
group.addComponent(today);
combo = new ComboBox("Explicit size");
combo.setInputPrompt("You can type here");