Try:
a) create desired label definition ( I call mine Customer.lbx )
b) create desired form / window ( I call mine PPreview )
c) try the following:

do form spr_32\ppreview
report form dbf\customer.lbx ;
Preview ;
for recno() > 1000 ;
noconsole ;
window ppreview ;
in window PPreview ;
nowait && secret is qualifying the label file as 'xxxx.LBX'
wait window "How does this look?"