OK. Here is a snippet from the on-line help. I got there exactly as I
described.
Response The setting indicates how the NotInList event was handled. The
Response argument can be one of the following intrinsic constants:
Constant Description
acDataErrDisplay (Default) Displays the default message to the user. You can
use this when you don't want to allow the user to add a new value to the combo
box list.
acDataErrContinue Doesn't display the default message to the user. You can use
this when you want to display a custom message to the user. For example, the
event procedure could display a custom dialog box asking if the user wanted to
save the new entry. If the response is Yes, the event procedure would add the
new entry to the list and set the Response argument to acDataErrAdded. If the
response is No, the event procedure would set the Response argument to
acDataErrContinue.
acDataErrAdded Doesn't display a message to the user but enables you to add
the entry to the combo box list in the NotInList event procedure. After the
entry is added, Microsoft Access updates the list by requerying the combo box.
Microsoft Access then rechecks the string against the combo box list, and saves
the value in the NewData argument in the field the combo box is bound to. If the
string is not in the list, then Microsoft Access displays an error message.
Did you open a code module and go to VBA HELP? This help is not available from
ACCESS help (and yes, that is a pain).