dbnavigator ändern

[tom_po]

ich möchte im Quellcode die Anzeige meines DBNavigators ändern, habe dies versucht:

Delphi-Quellcode:

procedure TMainForm.InsertPurchasingPlanning1Click(Sender: TObject);
var nbinsert,nbdelete: string;
begin

showdbview('select  Client,tipo as "Group",Order as "Order",Article as "Style",Pieces,'
+'planfabric,planacess,finaldate as "Delivery Date",observations as "Remarks"'
+'from orders where planfabric is null or planacess is null ','Insert Purchasing Planning',true,true);

dbview.dbnavigator1.VisibleButtons[nbinsert,nbdelete]:=false;
end;

aber bekomme die Fehlermeldung: Array-Typ erforderlich! Was muss ich tun?