LoadMenu discard the MFS_GRAYED flag?

I have such code

  CMenu cMenu;
  VERIFY(cMenu.LoadMenu(IDR_FAVORITE_POPUP));
  CMenu* pPopup = cMenu.GetSubMenu(0); 
  pPopup->EnableMenuItem(ID_FAVORITE_DELETE,MF_GRAYED);
  CXTPCommandBars::TrackPopupMenu(pPopup,TPM_LEFTALIGN, point.x, point.y,this, NULL);

  but the MF_GRAYED not appeared, and if i use the winapi ::TrackPopupMenu() and the
effect will appear, so I study the source code of XTP,and added such code belows:

BOOL CXTPCommandBar::LoadMenu(CMenu* pMenu, BOOL bRemoveControls)
{
 if (!pMenu || !::IsMenu(pMenu->m_hMenu))
  return FALSE;

 if (bRemoveControls)
  m_pControls->RemoveAll();
 
 BOOL bSeparator = FALSE;
 for (int i = 0; i < ::GetMenuItemCount(pMenu->m_hMenu); i++)
 {
  // Check to see if the item is a separator, we don't want
  // to use GetMenuItemID(i) because it may not equal zero.
  MENUITEMINFO info = { sizeof(MENUITEMINFO), MIIM_TYPE };
  ::GetMenuItemInfo(pMenu->m_hMenu, i, TRUE, &info);

  if ((info.fType & MFT_SEPARATOR) == MFT_SEPARATOR)
   bSeparator = TRUE;
  else
  {
   CXTPControl* pControl = m_pControls->AddMenuItem(pMenu, i);

   if (pControl && bSeparator)
   {
    pControl->SetBeginGroup(TRUE);
    bSeparator = FALSE;
 
   }

   //added such code but the SetEnabled() function  don't effect ??? why??
   if (info.fState & MFS_GRAYED)
   {
    pControl->SetEnabled(FALSE);
    
   }
  }
 }
 CFrameWnd* pFrame = GetParentFrame();
 if (pFrame) pFrame->DelayRecalcLayout();
 return TRUE;
}

why?? does the xtp discard the MFS_GRAYED???