Adding an "All" selection to a combo box

[Andrea]

Can anyone give any advice on adding all to a combo box.
I would like to be able to either select one category from
a combo box on a form and then click a button to view
results or select all and click the button and view
results for all categories.

 

[Alphonse Giambrone]

Check out.
http://www.mvps.org/access/forms/frm0043.htm