Janis,

>We have many comboboxes whose list data is created with SQL stored procedures. >Having the call to the stored procedure in the MOUSEDOWN does not work well >with tabbing into the field. Putting the call in the WHEN seems to work well, >but is this a proper place for it? If the cursor for the combobox already >exists, then the call isn't made to avoid unnecessary calls. But depending on >changes to other object values, the stored procedure may need to be run again.

FWIW, I typically do not try to make my comboboxes this intelligent. If I have a situation where a change to another object's value makes it necessary to requery a combobox then I do the requery in the Valid() event of the other object. I also may requery a combo box in the form's Activate() event if there is a possibility that the data in the combobox's rowsource changed.

>Is the REQUERY a place to put a stored procedure call, or can the 'exec >sp_whatever' actually be put in the rowsource property, and then issue a >combobox.REQUERY?

The Requery() method of a combo box or list box is generally used to get the control's list in synch with the control's rowsource.

HTH