private class PickUsersFunction extends ScriptableFunctionBase {
protected Object execute(Object thiz, Object[] args) throws Exception {
final Scriptable options = (Scriptable) args[0];
final ScriptableFunction onComplete = (ScriptableFunction) args[1];
// title is optional. default = null
final String title;
final Object titleObj = options.getField("title");
if(titleObj.equals(UNDEFINED)) {