Function app_ui_select 

fn app_ui_select(
    artifact_root: &Path,
    id: &str,
    name: &str,
    label: &str,
    label_class: &str,
    class_name: &str,
    attributes_html: &str,
    options_html: &str,
) -> Option<String>

Renders one canonical select control owned by the selected app bundle.