>get_secondary( array( 'parent_slug' => $parent_slug, 'slug' => $slug ), false );

			if ( ! $sub_items ) {
				return false;
			}

			$sub_item = reset( $sub_items );

			if ( empty( $sub_item->slug ) ) {
				return false;
			}

			// Delete the child.
			unset( $this->nav[ $this->object_id ][ $parent_slug . '/' . $slug ] );

			// Return the deleted item's screen function.
			return array( $sub_item->screen_function );

		// We're deleting a parent.
		} else {
			// Validate the nav.
			$nav_items = $this->get_primary( array( 'slug' => $slug ), false );

			if ( ! $nav_items ) {
				return false;
			}

			$nav_item = reset( $nav_items );

			if ( empty( $nav_item->slug ) ) {
				return false;
			}

			$screen_functions = array( $nav_item->screen_function );

			// Life's unfair, children won't survive the parent :(
			$sub_items = $this->get_secondary( array( 'parent_slug' => $nav_item->slug ), false );

			if ( ! empty( $sub_items ) ) {
				foreach ( $sub_items as $sub_item ) {
					$screen_functions[] = $sub_item->screen_function;

					// Delete the child.
					unset( $this->nav[ $this->object_id ][ $nav_item->slug . '/' . $sub_item->slug ] );
				}
			}

			// Delete the parent.
			unset( $this->nav[ $this->object_id ][ $nav_item->slug ] );

			// Return the deleted item's screen functions.
			return $screen_functions;
		}
	}

	/**
	 * Sorts a list of nav items.
	 *
	 * @since 2.6.0
	 *
	 * @param array $items The nav items to sort.
	 * @return array
	 */
	public function sort_nav( $items ) {
		$sorted = array();

		foreach ( $items as $item ) {
			// Default position.
			$position = 99;

			if ( isset( $item->position ) ) {
				$position = (int) $item->position;
			}

			// If position is already taken, move to the first next available.
			if ( isset( $sorted[ $position ] ) ) {
				$sorted_keys = array_keys( $sorted );

				do {
					$position += 1;
				} while ( in_array( $position, $sorted_keys ) );
			}

			$sorted[ $position ] = $item;
		}

		ksort( $sorted );
		return $sorted;
	}

	/**
	 * Gets the primary nav items.
	 *
	 * @since 2.6.0
	 *
	 * @param array $args Filters to select the specific primary items. See wp_list_filter().
	 * @param bool  $sort True to sort the nav items. False otherwise.
	 * @return array The list of primary objects nav
	 */
	public function get_primary( $args = array(), $sort = true ) {
		$params = bp_parse_args(
			$args,
			array(
				'primary' => true,
			)
		);

		// This parameter is not overridable.
		if ( empty( $params['primary'] ) ) {
			return false;
		}

		$primary_nav = wp_list_filter( $this->nav[ $this->object_id ], $params );

		if ( ! $primary_nav ) {
			return false;
		}

		if ( true !== $sort ) {
			return $primary_nav;
		}

		return $this->sort_nav( $primary_nav );
	}

	/**
	 * Gets the secondary nav items.
	 *
	 * @since 2.6.0
	 *
	 * @param array $args Filters to select the specific secondary items. See wp_list_filter().
	 * @param bool  $sort True to sort the nav items. False otherwise.
	 * @return bool|array The list of secondary objects nav, or false if none set.
	 */
	public function get_secondary( $args = array(), $sort = true ) {
		$params = bp_parse_args(
			$args,
			array(
				'parent_slug' => '',
			)
		);

		// No need to search children if the parent is not set.
		if ( empty( $params['parent_slug'] ) && empty( $params['secondary'] ) ) {
			return false;
		}

		$secondary_nav = wp_list_filter( $this->nav[ $this->object_id ], $params );

		if ( ! $secondary_nav ) {
			return false;
		}

		if ( true !== $sort ) {
			return $secondary_nav;
		}

		return $this->sort_nav( $secondary_nav );
	}

	/**
	 * Gets a nested list of visible nav items.
	 *
	 * @since 2.6.0
	 *
	 * @return array The list of visible nav items.
	 */
	public function get_item_nav() {
		$primary_nav_items = $this->get_primary( array( 'show_for_displayed_user' => true ) );

		if ( $primary_nav_items ) {
			foreach( $primary_nav_items as $key_nav => $primary_nav ) {
				// Try to get the children.
				$children = $this->get_secondary( array( 'parent_slug' => $primary_nav->slug, 'user_has_access' => true ) );

				if ( $children ) {
					$primary_nav_items[ $key_nav ] = clone $primary_nav;
					$primary_nav_items[ $key_nav ]->children = $children;
				}
			}
		}

		return $primary_nav_items;
	}
}