Excel - CommandBarBuiltin

Syntax:
=CommandBarBuiltIn(Index)

Description:
Returns TRUE when the commandbar is an Excel built-in command bar and FALSE if it is a custom commandbar.

Example:
Determine whether the first command bar in the commandbars collection is a built-in command bar.
=CommandBarBuiltin(1)
Determine whether the commandbar named "SQL*XL" is a built-in command bar.
=CommandBarBuiltin("SQL*XL")