I am trying to make changes to an existing Access database written by someone else. A form is used to display rows of information on screen. I am trying to hide rows as the tasks become completed based upon entry in a particular field. The list is a list box that's source is a union query, whose source is a linked table, that is linked to a table in another database file. I am attempting to hide rows by filtering them, using a checkbox. Ultimately if the check box is checked, it hides the filtered rows. If it is unchecked, all records should show. Whenever I try to use a filter, I get an error "The object does not contain the Automation object "x". I've tried referencing everything except the external database table, which I wouldn't know how to reference. Any ideas?