titleStringThe name of the Submenu for display in the user interface. The title includes any ampersand characters (&), which are used to tell the Windows OS to underline the following character in the name for use with the Alt key to navigate to a menu item. Double ampersands are used to display an actual ampersand character in the name. The Mac OS ignores and removes the extra ampersand characters.
at?LocationOptionsThe location of the submenu relative to the reference object or within the containing object.
reference?MenuElementThe reference object. Note: Required when the at parameter specifies before or after.
withProperties?ObjectInitial values for properties of the new Submenu