Richard,
I will double check on Monday but I believe we don't support this anymore.
We have a style attribute for Table called "highlightCurrentRow":
https://4js.com/techdocs/genero/fgl/devel/DocRoot/User/PresentationStyles.html#STYATT_TABLE... but it's for tables, so this will have no effect if you are using fixed screen arrays.
We will certainly have to support that old FGLPROFILE setting again, we work on BDS compatibility in 2.20.
May I suggest that you give a chance to TABLE + DIALOG.setCellAttributes() or setArrayAttributes()?
https://4js.com/techdocs/genero/fgl/devel/DocRoot/User/ClassDialog.html#setArrayAttributesSeb