final ComboBoxItem severityLevel = new ComboBoxItem();
severityLevel.setTitle("Severity Level");
severityLevel.setValueMap("Severity 1", "Severity 2", "Severity 3");
severityLevel.setDefaultValue("Severity 2");
severityLevel.addItemHoverHandler(new ItemHoverHandler() {
public void onItemHover(ItemHoverEvent event) {
String prompt = "Status can only be changed by the bug's owner";
if (!severityLevel.isDisabled()) {
prompt = getHoverText((String) severityLevel.getValue());
}