procedure MainMenuToTreeView(MenuItem:TMenuItem;PTreeview:TTreeView;PTreeNode:TTreeNode);
var
 i:Integer;
 newNode:TTreeNode;
begin
 for i:=0 to MenuItem.Count-1 do
  begin
   newNode:=PTreeview.Items.AddChild(PTreeNode,MenuItem[i].Caption);
   MainMenuToTreeView(MenuItem[i],PTreeView,newNode);
  end;
end;

procedure TForm1.X1Click(Sender: TObject);
begin
 Application.Terminate;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
 MainMenuToTreeView(MainMenu1.Items,TreeView1,nil);
end;