Business rule to hide or show a new button

Prophet 21
1

Hi,
We are writing a business rule to hide or show a new button (cb_usersdb047) in Item Maintenance screen based on the item_desc field is null or not.
How do we access the button in business rule –
we need to do something like
Data.Fields[“cb_usersdb047”].Visible = false;

I know it is not a data field.

Any suggestions welcome.

Thanks