How do i disable macros when opening a workbook in code?

I have a workbook that creates a new menu when it opens
and destroys the menu when it closes. One of the choices
in that menu is to open an older version of that same
workbook and import its data and then close that workbook.
When it closes, it destroys the wrong menu. How do i solve
this problem?

One way would be to disable macros on the workbook that is
opened in code. Another would be to temporarily set macro
security to high. Any other ideas?