unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;

type
  TForm1 = class(TForm)
    btnOK: TButton;
    btnAbbrechen: TButton;
    procedure btnOKClick(Sender: TObject);
    procedure btnAbbrechenClick(Sender: TObject);
    function modalErgebnis(): String;
    procedure FormActivate(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}


 procedure TForm1.btnOKClick(Sender: TObject);
begin
  Form1.ModalResult:=mrOk;
end;

procedure TForm1.FormActivate(Sender: TObject);
begin
   ShowMessage( modalErgebnis() );
end;

procedure TForm1.btnAbbrechenClick(Sender: TObject);
begin
  Form1.ModalResult:=mrCancel;
end;

function TForm1.modalErgebnis(): String;
begin
  if Form1.ModalResult=mrOk then
  begin
    result:='OK';
  end
  else if Form1.ModalResult=mrCancel then
  begin
     result:='Abbrechen';
  end
  else
  begin
    result:='False';
  end;
end;

end.