The Data Fields tab shows all data fields of the data group and the corresponding
Add Data Field allows new data
fields to be created.
Field will delete the selected data field and all data saved under it. Data fields that are
connected to view or edit elements cannot be deleted as long as the connection exists.
Edit Data Field opens a dialog in which the data field title, the Foreign Key, which is assigned when
referencing a foreign data group, and the existing connections to view or edit elements will be shown.