Programming MUI 2
The same program (MUI-Demo) looks at AROS x86_64 like this:
So far it looks ok, just the texts are not complete shown, it seems that the width calculation does not care about the scrollbar so the text continues under the scrollbar and is half hidden. but at least it work. I did not find this MUI demo compiled for AROS so I cannot compare to C program, but I can compare to the Amiga, where are C and Pascal versions looks exactly the same.