How do I create an unbound ListBox on a custom Outlook
form?  When I add a ListBox it doesn't let me fill in the
possible values unless I associate it with a field.  I
want to create an unbound multi-select ListBox with a
Click event that sets the value of a custom field to the
list of selected items.

I already tried a ListBox bound to a field, but that
doesn't show the saved selections when I reopen the form.  
I wrote an Open event that selects the items when the form
opens, but if the user switches to a different page and
back again the list clears.

Any help would be greatly appreciated.