contentPane.addMember(hLayout);
executionModeItem.addChangedHandler(new ChangedHandler() {
public void onChanged(ChangedEvent event) {
if (event.getValue().equals(EXECUTION_ORDER_PARALLEL)) {
haltOnFailureItem.hide();
memberExecutionOrderer.hide();
} else {
haltOnFailureItem.show();
memberExecutionOrderer.show();
}