OK, I tried your suggestion as follows:
In the load portion of the form I put the code:
OPEN DATABASE stkmktdat
LOCAL ARRAY gatbls(1)
LOCAL lnlen
m.lnlen=ADBOBJECTS(gatbls, "table")

In the listbox Data portion of the properties window I put:
Number of Elements = 5
Row Source = gatbls
Row Source Type = 5 – Array

When I run the form in interactive and in compile mode I get the error message:
‘gatbls’ is not an array

What am I doing wrong?