Jon,

Setall is a good way.
or
If I have some text boxes to enable or disable but not all, I usually put the same flag value into the Tag property of each text box to get that treatment. then I run through the collection like this

for each oControl in thisform.pageframe1.pagefoo.controls
   if oControl.tag = "MYFLAG"
      oControl.enabled = .t.
   else
      oControl.enabled = .f.
   endi
endf