How to make cas-mode program visible when choosing from program library

[teerasak]

Thank you, Cyrille for your help.

I'm quite new to HP Prime programming. Not get what you try to explain.

Let's say, my program written in cas mode is like this:

#cas
Test123(AB,CD):=
BEGIN
RETURN AB*CD;
END;
#end


what should I do (or added in the code) to make the program visible in the list