How to change Screen Input type from "Enter" to "Display" via 4GL?

SOLVED

I have a need to set the format of fields on a screen to "Display" when a certain value is detected in a field.

I know how I could suppress it conditionally, but that's not what I want to do.

Basically... if I were writing the suppress for it I would say:

if [M:ZBNH1]ZSHIPPED=2
Chgfmt [M:ZBNH1]ZSOHNUM With "-K:10"
Chgfmt [M:ZBNH1]ZSTOFCY With "-K:10"
Chgfmt [M:ZBNH1]ZBPTNUM With "-K:10"
Chgfmt [M:ZBNH1]ZMDL With "-K:10"
Chgfmt [M:ZBNH1]ZACTFRT With "-K:10"
Endif

I basically need something like this... only instead of suppressing the field, I just want it to change from "Enter" to "Display".