No matter what I seem to do, I can’t get the listbox to load any more than a single column. What control properties must be set, for a listbox to load from the table (including column heads)?
in most cases a listbox is connected to a foreign key of a table. It will set the value of this key into the table - only one field of the table.
You could show more than one field of the second table, which is datasource of the foreign key. It will work like described here: LO Base - concatenate existing fields and create a field that displays it - #11 by gshockxcc
Sounds like you search for a grid control inside a listbox ?
To add also column heads you could add them via UNION, but selcting the head may cause more trouble than this is worth.