MFC拆分窗口问题

程序段：
LRESULT CMainFrame::OnMyChange(WPARAM wparam, LPARAM lparam)
{
CCreateContext Context;
if (wparam == NM_B)
{

    //MessageBox(TEXT("NM_B！图像界面"));
    Context.m_pNewViewClass = RUNTIME_CLASS(CMFCApplicationView);
    Context.m_pCurrentFrame = this;
    Context.m_pLastView = (CFormView*)m_spliter.GetPane(0, 1);
    m_spliter.DeleteView(0, 1);
    m_spliter.CreateView(0, 1, RUNTIME_CLASS(CMFCApplicationView), CSize(600, 500), &Context);
    CMFCApplicationView* pNewView = (CMFCApplicationView*)m_spliter.GetPane(0, 1);
    m_spliter.RecalcLayout();
    pNewView->OnInitialUpdate();
    m_spliter.SetActivePane(0, 1);
}//这个有问题，而下面的就没有问题
if (wparam == NM_C)
{
    //MessageBox(TEXT("NM_B！图像界面"));
    Context.m_pNewViewClass = RUNTIME_CLASS(CSelectView);
    Context.m_pCurrentFrame = this;
    Context.m_pLastView = (CFormView*)m_spliter.GetPane(0, 1);
    m_spliter.DeleteView(0, 1);
    m_spliter.CreateView(0, 1, RUNTIME_CLASS(CSelectView), CSize(600, 500), &Context);
    CSelectView* pNewView = (CSelectView*)m_spliter.GetPane(0, 1);
    m_spliter.RecalcLayout();
    pNewView->OnInitialUpdate();
    m_spliter.SetActivePane(0, 1);    
}

报错段：
BOOL CObject::IsKindOf(const CRuntimeClass* pClass) const
{
ENSURE(this != NULL);//报错位置
// it better be in valid memory, at least for CObject size
ASSERT(AfxIsValidAddress(this, sizeof(CObject);
#其中上面的CMFCApplicationView是CView类，而下面的CSelectView是CFormView类，如果改用CFormView类就不会发生报错

求大佬帮忙