CommandBarControls.Add([Type], [Id], [Parameter], [Before],
[Temporary])

where the parameters are:

Type

   The type of menu. Valid constants are msoControlButton,
msoControlEdit,
   msoControlDropdown, msoControlComboBox, and msoControlPopup.

Id

   The menu item's identifier. For a custom item, this should be
left or
   or set to 1.

Parameter

   Passes arguments to the procedure that the menu item invokes.

Before

   Position before which the new menu item should appear.

Temporary

   If True, deletes the menu item when Excel is closed.