BP_Core_Nav::add_nav( array $args )

	public function add_nav( $args ) {
		if ( empty( $args['slug'] ) ) {
			return false;
		}

		// We have a child and the parent exists.
		if ( ! empty( $args['parent_slug'] ) ) {
			$slug              = $args['parent_slug'] . '/' . $args['slug'];
			$args['secondary'] = true;

		// This is a parent.
		} else {
			$slug            = $args['slug'];
			$args['primary'] = true;
		}

		// Add to the nav.
		$this->nav[ $this->object_id ][ $slug ] = new BP_Core_Nav_Item( $args );

		return $this->nav[ $this->object_id ][ $slug ];
	}