As additional note, when adding the record after the TAB the focus gets lost.
This was an issue for me, so I found a way to select the new row and focus it.
// creates the new record with a unique identifier
var newRecord = new Item() {Id = myId }
// adds the record
await GridInstance.AddRecord(newRecord);
// retrieves the index by primary key
var ix = await GridInstance.GetRowIndexByPrimaryKey(myId);
// selects the record / row
await GridInstance.SelectRow(ix);
// edits it
await GridInstance.StartEdit();
I hope it helps!