I recently discovered, however, that all public functions are displayed in the "Insert Function" dialogue box when you select "User Defined" in the "Or select a category" drop down list.
This happens even if you password protect the project and lock it for viewing.
To get to the "Insert Function" dialogue box press Shift-F3.
Private functions are not displayed in the list, but it is impossible to make all functions private, especially if you want to reuse them across modules.
Is there a way to prevent public functions stored in a protected add-in from being displayed in the "Insert Function" dialogue box in Excel?
Thanks!