final Form<RoleAssignment> form = new Form<RoleAssignment>(RoleAssignment.class);
String title = type == GROUP ? Console.CONSTANTS.common_label_group() : Console.CONSTANTS.common_label_user();
final PrincipalFormItem principalItem = new PrincipalFormItem(type, "principal", title);
principalItem.setRequired(true);
principalItem.update(principals);
final TextBoxItem realmItem = new TextBoxItem("realm", "Realm", false);
final ComboBoxItem includeExcludeItem = new ComboBoxItem("includeExclude",
Console.CONSTANTS.administration_include_exclude());
includeExcludeItem.setValueMap(
new String[]{Console.CONSTANTS.common_label_include(), Console.CONSTANTS.common_label_exclude()});