[BlackMonsta]

не пойму почему выходит ошибка :

Код:

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unit Unit1;   interface   uses   Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,   Dialogs, ComCtrls, StdCtrls, OleCtrls, SHDocVw, Menus;   type   TForm1 = class(TForm)     Button1: TButton;     Button2: TButton;     Button3: TButton;     PageControl1: TPageControl;     WebBrowser1: TWebBrowser;     PopupMenu1: TPopupMenu;     procedure Button1Click(Sender: TObject);     procedure Button2Click(Sender: TObject);   private     { Private declarations }   public     { Public declarations }   end;   TWebTabSheet = class (TTabSheet)   private     ppdisp: IDispatch;     FBrowser: TWebBrowser;   public     property Browser: TWebBrowser read FBrowser;   end;   var   Form1: TForm1;   implementation   {$R *.dfm}   procedure TForm1.Button1Click(Sender: TObject); var   ts: TWebTabSheet;   popup: TPopupMenu; begin   ts:= TWebTabSheet.Create(PageControl1);   ts.PageControl:= PageControl1;   ts.Caption:= 'New Page';   PageControl1.ActivePage:= ts;   popup:= TPopupMenu.Create(Self);   ts.PopupMenu:= (PageControl1.ActivePage as TWebTabSheet).PopupMenu; end;   procedure TForm1.Button2Click(Sender: TObject); var PopupItm: TMenuItem; begin PopupItm:= TMenuItem.Create(nil); PopupItm.Caption:= (PageControl1.ActivePage as TWebTabSheet).Caption; (PageControl1.ActivePage as TWebTabSheet).PopupMenu.Items.Add(PopupItm); end;   end.

Когда вызываю Button2 то выходит ошибка... не пойму почему