Здравствуйте Snoop, Вы писали:


O$>>Делай выбор в InitInstance (посмотри как она сделана для SDI и Dialog-Based)

S>Спасибо, но это при старте. А как переключится в процессе работы?

Пример из МСДН

Переключение View

void CMainFrame::OnExample(UINT nCmdID)  // Обработчик нажатия кнопок переключающих вьювы
{
    if (nCmdID == m_nCurrentExample)
        return;  // already selected

    // Set the child window ID of the active view to AFX_IDW_PANE_FIRST.
    // This is necessary so that CFrameWnd::RecalcLayout will allocate
    // this "first pane" to that portion of the frame window's client
    // area not allocated to control bars.  Set the child ID of
    // the previously active view to some other ID; we will use the
    // command ID as the child ID.
    CView* pOldActiveView = GetActiveView();
        ::SetWindowLong(pOldActiveView->m_hWnd, GWL_ID, m_nCurrentExample);

    CRuntimeClass* pNewViewClass;
    switch (nCmdID)
    {
        case ID_STRINGLIST:
            pNewViewClass = RUNTIME_CLASS(CStringListView);
            break;
        case ID_TYPEDLIST:
            pNewViewClass = RUNTIME_CLASS(CTypedPtrListView);
            break;
        case ID_INTLIST:
            pNewViewClass = RUNTIME_CLASS(CIntListView);
            break;
        default:
            ASSERT(0);
            return;
    }

    // create the new view
    CCreateContext context;
    context.m_pNewViewClass = pNewViewClass;
    context.m_pCurrentDoc = GetActiveDocument();
    CView* pNewView = STATIC_DOWNCAST(CView, CreateView(&context));
    if (pNewView != NULL)
    {
        // the new view is there, but invisible and not active...
        pNewView->ShowWindow(SW_SHOW);
        pNewView->OnInitialUpdate();
        SetActiveView(pNewView);
        RecalcLayout();
        m_nCurrentExample = nCmdID;

        // finally destroy the old view...
        pOldActiveView->DestroyWindow();
    }
}

Удачи.