unit Unit1;
 
interface
 
uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs;
 
type
  TMyType = (mtFirst, mtSecond, mtThird);
 
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  private
    FMyProp: TMyType;
    { Private declarations }
  public
    property MyProp : TMyType read FMyProp write FMyProp;
  end;
 
var
  Form1: TForm1;
 
implementation
 
{$R *.dfm}
 
procedure TForm1.FormCreate(Sender: TObject);
begin
  MyProp := TMyType(0);  // mtFirst
  MyProp := TMyType(1);  // mtSecond
  MyProp := TMyType(2);  // mtThird
end;
 
end.