This is very similar to using radio layouts.
# Items
C8 <LEN> 3B 21 F0 00 60 <CHARS> <CS>
C8 <LEN> 3B 21 F0 00 41 <CHARS> <CS>
C8 <LEN> 3B 21 F0 00 42 <CHARS> <CS>
C8 <LEN> 3B 21 F0 00 43 <CHARS> <CS>
C8 <LEN> 3B 21 F0 00 44 <CHARS> <CS>
C8 <LEN> 3B 21 F0 00 45 <CHARS> <CS>
C8 <LEN> 3B 21 F0 00 46 <CHARS> <CS>
C8 <LEN> 3B 21 F0 00 47 <CHARS> <CS>
C8 <LEN> 3B 21 F0 00 48 <CHARS> <CS>
C8 <LEN> 3B 21 F0 00 49 <CHARS> <CS>
C8 <LEN> 3B 21 F0 00 53 <CHARS> <CS> # Lonely item in top right
# Back Button
C8 <LEN> 3B 21 F0 00 50 <CHARS> <CS>
# Title and render layout
C8 <LEN> 3B A5 F0 01 00 <CHARS> <CS>
# Highlight 5th Item
# Add 0b1000_0000 (0x80) to last argument (0x44)
# 0x44 | 0x80 = 0xC4
C8 <LEN> 3B 21 F0 00 C4 <CHARS> <CS> # I am chosen!
The value returned by 0x31 can be specified.
# User Defined IDs denoted by: [XX]
# Items
C8 <LEN> 3B 21 F0 [FF] 60 "21 F0 FF 60" <CS>
C8 <LEN> 3B 21 F0 [EE] 41 "21 F0 EE 41" <CS>
C8 <LEN> 3B 21 F0 [DD] 42 "21 F0 DD 42" <CS>
C8 <LEN> 3B 21 F0 [CC] 43 "21 F0 CC 43" <CS>
C8 <LEN> 3B 21 F0 [BB] 44 "21 F0 BB 44" <CS>
C8 <LEN> 3B 21 F0 [AA] 45 "21 F0 AA 45" <CS>
C8 <LEN> 3B 21 F0 [99] 46 "21 F0 99 46" <CS>
C8 <LEN> 3B 21 F0 [88] 47 "21 F0 88 47" <CS>
C8 <LEN> 3B 21 F0 [77] 48 "21 F0 77 48" <CS>
C8 <LEN> 3B 21 F0 [66] 49 "21 F0 66 49" <CS>
C8 <LEN> 3B 21 F0 [44] 53 "21 F0 44 53" <CS> # Out of order field
# Back button accepts ID!
C8 <LEN> 3B 21 F0 [55] 50 "21 F0 55 50" <CS>
# Title and render layout
C8 <LEN> 3B A5 F0 00 00 "User Defined ID" <CS>
User Defined IDs Returned by 0x31
Once the button ID is set, it cannot be changed! It's not until GT renders Main Menu, that this value can be changed. Updating the button label, or removing the button altogether before attempting to change the value had no effect.
Lines and Inputs can be omitted, and just the title set, ala "BLUETOOTH PAIRING".
# Title Only
C8 <LEN> 3B A5 F0 00 00 "BLUETOOTH PAIRING" <CS>
# Press
3B <LEN> C8 31 F0 00 00 <CS>
3B <LEN> C8 31 F0 00 01 <CS>
3B <LEN> C8 31 F0 00 02 <CS>
3B <LEN> C8 31 F0 00 03 <CS>
3B <LEN> C8 31 F0 00 04 <CS>
3B <LEN> C8 31 F0 00 05 <CS>
3B <LEN> C8 31 F0 00 06 <CS>
3B <LEN> C8 31 F0 00 07 <CS>
3B <LEN> C8 31 F0 00 08 <CS>
3B <LEN> C8 31 F0 00 09 <CS>
3B <LEN> C8 31 F0 00 10 <CS> # Back Button
3B <LEN> C8 31 F0 00 13 <CS> # Top Right
# Add 0x20 to last byte
# Add 0x40 to last byte
TODO