视图分割的问题, 为什么子窗口的宽度总为零

BOOL CMainFrame::OnCreateClient(LPCREATESTRUCT lpcs, CCreateContext* pContext) 
{
    m_wndMainSplitter.CreateStatic(this,
                                   1, 
                                   2);    m_wndMainSplitter.CreateView(0, 
                                 1,
                                 RUNTIME_CLASS(CSysInfoFormView),
                                 CSize(300, 0),
                                 pContext);    m_wndSubSplitter.CreateStatic(&m_wndMainSplitter,
                                  2,
                                  1,
                                  WS_CHILD | WS_VISIBLE,
                                  m_wndMainSplitter.IdFromRowCol(0, 0));    m_wndSubSplitter.CreateView(0,
                                0,
                                RUNTIME_CLASS(CSysLogView),
                                CSize(300, 200),
                                pContext);    m_wndSubSplitter.CreateView(1, 
                                0, 
                                RUNTIME_CLASS(CCurUserFormView),
                                CSize(300, 0),
                                pContext);    return TRUE;
    //return CFrameWnd::OnCreateClient(lpcs, pContext);
}
左边上下两窗口的宽度总为零,即右边的窗口占据整个客户区