I Asking about DVD-Lab Application ... why GPRM for Sub-pictures Starts from 64 while for Audio steam starts from 0.
see command on menu which is used for highlighting buttons on menu...
below script is used for Audio Setup and button highlighting ...

GPRM0 = SPRM1
GPRM1 = 1024
if (GPRM0 == 1) GPRM1 = 2048
if (GPRM0 == 2) GPRM1 = 3072
SetHL_BTN GPRM1
Break


next is for Subtitle Streams and button highlighting on subtitle menu ...


GPRM0 = SPRM2
GPRM1 = 1024
if (GPRM0 == 64) GPRM1 = 2048
if (GPRM0 == 65) GPRM1 = 3072
if (GPRM0 == 66) GPRM1 = 4096
SetHL_BTN GPRM1
Break


thank you for your Guides