//Showing AlertDialog with a message and a title
$AlertDialog().title("Example").message("This is an example")
              .positiveButton("OK");


//Displaying a select with any object (it uses the object toString method)
@Model
List<User> users;

$AlertDialog().title("Select User").items(usersList);

if ($AlertDialog.ItemSelected) {
    $Toast("The user selected was: {usersList[position]}");
}