Higher color depth for MFC toolbar icons?

HBITMAP hBitmap = (HBITMAP) ::LoadImage(AfxGetInstanceHandle(),
    MAKEINTRESOURCE(IDR_MAINFRAME), IMAGE_BITMAP,
    0,0, LR_CREATEDIBSECTION | LR_LOADMAP3DCOLORS);
CBitmap bm;
bm.Attach(hBitmap);

CImageList m_imagelist.Create(20, 20, ILC_COLOR8, 4, 4);
m_imagelist.Add(&bm, (CBitmap*) NULL);

m_toolbar.GetToolBarCtrl().SetImageList(&m_imagelist);

CImageList m_imagelist;
m_imagelist.Create(20, 20, ILC_COLOR8, 4, 4);
m_imagelist.Add(&bm, (CBitmap*) NULL);