Delphi XE2 Data Module expects only database components?

Question

In prior versions of Delphi, I have used the data module (TDataModule) as a place to keep non-visual components to avoid cluttering up the main form. In Delphi

Answer 1

This (buggy) behavior in

unit Unit2;

interface

uses
  System.SysUtils, System.Classes;

type
  TDataModule2 = class(TDataModule)
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  DataModule2: TDataModule2;

implementation

{%CLASSGROUP 'System.Classes.TPersistent'}

{$R *.dfm}

end.

is caused by the line

{%CLASSGROUP 'System.Classes.TPersistent'}

To get rid of just delete or modify the line into

{.%CLASSGROUP 'System.Classes.TPersistent'}

After switch to Design View you will see all the components as you expect.

(Delphi XE2 16.0.4504.48759)