Grouping Radiobuttons using Alphanumeric Editor (SE51)

Hi,

My SAP Installation allows me to use the Alphanumeric Layout Editor only. Can anyone tell me how I can group the radiobuttons in this layout editor of the Screen Painter?

I have tried assigning them to the same group but the Function Code field is always disabled in the Element List properties as well.

Any help would be much appreciated!!!

Regards,

Priya