public void onChange(ChangeEvent event) {
int selectedIndex = listBox.getSelectedIndex();
listBox.getElement().getStyle().setBackgroundColor(listBox.getValue(selectedIndex));
if (selectedWidget != null) {
BorderStyle borderStyle = null;
String selectedStyle = listBox.getItemText(selectedIndex);
if (selectedStyle.equals("DASHED")) {
borderStyle = BorderStyle.DASHED;
}