dumb groovy question - get all row members on a grid

Content

I've seen a lot examples of getting row members for cells that have been edited but what about if I just want to get all row members on the grid?

I tried this but doesn't work and not sure why:

Set<String> rowEntity = []
Set<String> rowVersions = []
operation.grid.dataCellIterator().each {
                                rowVersions << it.getMemberName("Versions")
                                rowEntity << it.getMemberName("Entity")

}