Delphi Berlin - Listview (A-Z headers duplicate)

Hi,

In Delphi Seattle I was able to add A-Z headers to my list view using Livebindings and FillHeaderCustomFormat = Substring(%s,0,1).

After upgrading to Delphi Berlin the A-Z headers will no longer group together in groups. Instead of having one header with the first letter of the text of the item - I now have one header per Item, ergo, the items are no longer group under the same header.

The following picture shows my problem:

What am I doing wrong?

Best regards

Jacob