Module::register_defaults()

	protected function register_defaults() {
		foreach ( $this->default_submodules as $slug => $class_name ) {
			$this->register( $slug, $class_name );
		}

		/**
		 * Fires when the default access controls have been registered.
		 *
		 * This action should be used to register custom access controls.
		 *
		 * @since 1.0.0
		 *
		 * @param Module $access_controls Form setting manager instance.
		 */
		do_action( "{$this->get_prefix()}register_access_controls", $this );
	}