My object-oriented comment referred to the fact that in VA-RPG, all
screen fields (parts in VA-RPG speak) must exist at compile time.

Which means:
1. All parts take up memory (more of an issue with PC apps)
2. Parts cannot be laid out via code, so overlapping parts are a pain
(not a problem with DDS)
3. Showing and hiding parts results in some strange painting issues (not
an issue with 5250)

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