DestroyWindow() not destroying child windows

I have a WTL SDI program where the views can change. To accomplish
this, a SwitchView() function is called and the view to switch to is
specified:

DIALOGS m_CurView; //DIALOGS is an enum with identifiers for each view
std::map<DIALOGS, CBase*> m_mViews;

BOOL CMainFrame::SwitchView(DIALOGS dlg)
{

    if (m_mViews[m_CurView]->BaseIsWindow())
        m_mViews[m_CurView]->BaseDestroyWindow();

    m_CurView = dlg;
    m_hWndClient = m_mViews[m_CurView]->BaseCreate(m_hWnd);
    if (!m_mViews[m_CurView]->BaseIsWindow())
        return FALSE;

    RECT rcWnd = {0};
    GetClientRect(&rcWnd);
    m_mViews[m_CurView]->BaseMoveWindow(&rcWnd, FALSE);
    m_mViews[m_CurView]->BaseShowWindow(SW_SHOW);
    m_mViews[m_CurView]->BaseSetFocus();

    return TRUE;
}

This destroys the current view and creates the requested view. But,
when the DestroyWindow() is called on the current view, the child
windows (such as CStatics) don't get the WM_DESTROY message, so when I
return to the dialog, I get all kinds of nasty failures.

Each view class derives from a CBaseViewT class so that I can specify
them generically in the CMainFrm. (as above in the SwitchView()
function).

class CBase
{
public:
    virtual BOOL BasePreTranslateMessage(MSG* pMsg) = 0;
    virtual HWND BaseCreate(HWND hWndParent, LPARAM dwInitParam = NULL)
= 0;
    virtual BOOL BaseMoveWindow(LPCRECT lpRect, BOOL bRepaint = TRUE) =
0;
    virtual BOOL BaseDestroyWindow() = 0;
    virtual HWND BaseSetFocus() = 0;
    virtual BOOL BaseIsWindow() = 0;
    virtual BOOL BaseShowWindow(int nCmdShow) = 0;
};

template <class T>
class CBaseViewT : public CBase
{
    //...Implementation of virtual functions in CBase() that just call
the CWindow() counterparts
    // For Example:
    BOOL BaseDestroyWindow()
    {
        T* pT = static_cast<T*>(this);
        return pT->DestroyWindow();
    };
};

Can anybody tell me why the child windows of the views aren't being
properly destroyed?

Thanks,
 PaulH