Private sub workbook_open code running workbook_open code from other project

HI,

I have 2 workbooks.

The 1st book has:
Private sub workbook_open ()
code to open userform
end sub


The 2nd book has:
Private sub workbook_open ()
code to fill some cells and open workbook
end sub

When I open the 1st workbook the 2nd workbook_open code is run. Does anybody know why this could happen. Thanks

Of Course Shuckz. thx.
Yes the first book opens the 2nd to populate comboboxes. Any idea how I can avoid the other workbook_open() routine in this single instance.