Nothing very special about Authoring for Buttons. Use a Main Menu with several Menu Items as usual. The only thing different is that you make the main menu hot spots invisible.
TC-100 Application Notes
BCD TC-100
Application Notes
1. Superimpose Time Code Over Video
Switch 4 controls the display ON/OFF at the default "lower third" position. UP = ON.
The command DISP x positions the display at TV line x.
The TC-100 always reads both LTC and VITC
Switch 1 determines whether LTC or VITC is displayed.