Toolbar icons not displayed

I've got a variety of toolbars all of which are based on 32BPP bitmaps. All are created in the same way in the OnCreate() member function of my Frame window. The snap below shows the active undo and find buttons. The 'select view' shows my problem - no bitmap. Any clues to why this is happening?




Here is the code:

CXTPToolBar* pToolBarViews = pCB->Add(_T("Views"), xtpBarTop);
    if (pToolBarViews)
    {
        pToolBarViews->SetBarID(IDR_TOOLBAR_VIEWS);
        CXTPControlPopup* p = (CXTPControlPopup*)
        pToolBarViews->GetControls()->Add(xtpControlButtonPopup,ID_VIEW_SELECT);
        if (p)
        {
            p->SetStyle(xtpButtonCaption);
            p->SetCaption("Select View");
            CMenu menu;
            menu.LoadMenu(IDR_SYSTEM);
            p->SetCommandBar(menu.GetSubMenu(1));
        }
        pToolBarViews->GetControls()->Add(xtpControlButton,ID_VIEW_CONCISE);
        DockRightOf(pToolBarViews,pTBS);
    }

Thanks Oleg -