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..
type
 TFormDy = class(TForm)
 private

 published
  procedure OpFormClose(Sender: TObject; var Action: TCloseAction);
  procedure OpOnShow(Sender: TObject);
  procedure OpTimer1Timer(Sender: TObject);
  procedure ShowFormDy(sTxt: string);
 end;
 
var
 FormDy: TFormDy;
 Count: integer;
 Timer1: TTimer;
 

implementation
...
...


procedure TFormDy.ShowFormDyn(sTxt: string);
var
 Fdy: TForm;
begin
 
 Fdy := TForm.Create(nil); 
 try
 .. 
  Fdy.OnClose := OpFormClose; 
  Fdy.OnShow := OpOnShow;
  ..
  Fdy.ShowModal;
 finally
  Fdy.Free;
 end;
end;					

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procedure TFormDy.OpOnShow(Sender: TObject);
begin
 Count := 0;
 Timer1 := TTimer.Create(nil);
 Timer1.OnTimer := OpTimer1Timer;
 Timer1.Interval := 1000;
 Timer1.Enabled := True;
end;
 
procedure TFormDy.OpTimer1Timer(Sender: TObject);
begin
 Inc(Count);
// if  Count > 8 then Fdy.close; // <-- Fehler 
if  Count > 8 then TForm(Sender).Close; // <-- Fehler 
end;					

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unit uDynForm;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, ExtCtrls;

type
  TDynForm = class(TForm)
    Timer1: TTimer;
    procedure Timer1Timer(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

implementation

{$R *.dfm}

procedure TDynForm.Timer1Timer(Sender: TObject);
begin
  Close;
end;

end.					

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procedure TForm1.Button1Click(Sender: TObject);
var
  DynForm: TDynForm;
begin
  DynForm := TDynForm.Create(nil);
  try
    DynForm.ShowModal;
  finally
    DynForm.Free;
  end;
end;