Query linked to combo box... select all?

[kirky007]

Hiya,
I currently have a query that looks up staff names and then if they click a staff name from the combo box on a form they are then able to preview a report showing their performance. I want the combo box to have the ability to be left blank or the option to select all so that I can preview all their performance in the report.

How do i go about doing this?

Andy

 

[RuralGuy]

This link might help: Adding "All" to a listbox or combobox