1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:

type
  private
    OldCreate: procedure(Sender: TObject);
  [...]

Constructor TMyKompo.Create(Owner: TComponent);
begin
  Inherited Create(Owner);
  OldCreate:=@TForm(Owner).OnCreate;
  TForm(Owner).OnCreate:=fCreate;
end;

procedure TMyKompo.fCreate(Sender: TObject);
begin
  //Mein Code
  if Assigned(OldCreate) then
    OldCreate(Sender);
end;