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//das hier muss vor die Deklaration des Formulars
type
  TDBEdit = class(DBCtrls.TDBEdit)
  private
    { Private-Deklarationen }
    FAlignment: TAlignment;
  protected
    { Protected-Deklarationen }
    procedure SetAlignment(Value: TAlignment);
    procedure CreateParams(var Params: TCreateParams); override;
  public
    { Public-Deklarationen }
    property Alignment: TAlignment read FAlignment write SetAlignment
                        default taLeftJustify;
  end;
...

//und das hier in den implementation-Teil
procedure TDBEdit.CreateParams(var Params: TCreateParams);
const
  Alignments: array[TAlignment] of DWORD = (ES_LEFT, ES_RIGHT, ES_CENTER);
begin
  inherited CreateParams(Params);
  with Params do
    Style := Style or Alignments[FAlignment];
end;

procedure TDBEdit.SetAlignment(Value: TAlignment);
begin
  if FAlignment <> Value then
    begin
      FAlignment := Value;
      RecreateWnd;
    end;
end;