Why Doesn't I get 'IOleWindow*' (in Explorer Bar)

Why Doesn't I get 'IOleWindow*' (in Explorer Bar)

Hi. I'm making an Explorer Bar.
I'm trying to show the bar always.
So I use ShowBrowserBar funciton (in SetSite).

But on a IExplorer, in case the bar isn't checked (to active), I can't
get 'IOleWindow*'.
So I can't use ShowBrowserBar.

STDMETHODIMP CMyBar::SetSite(IUnknown* pUnkSite)
//If a site is being held, release it.
    if(m_pSite)
    {
        m_pSite->Release();
        m_pSite = NULL;
    }

    //If punkSite is not NULL, a new site is being set.
    if(pUnkSite)
    {
        //IExplore.exe =EC=B2=B4=ED=81=AC
        TCHAR pszLoader[MAX_PATH];
        GetModuleFileName(NULL, pszLoader, MAX_PATH);
        _tcslwr(pszLoader);

        if (_tcsstr(pszLoader, L"\\iexplore.exe") == NULL) {
            return E_FAIL;
        }

        //Get the parent window.
        IOleWindow *pOleWindow = NULL;

        m_hWndParent = NULL;

        if(SUCCEEDED(pUnkSite->QueryInterface(IID_IOleWindow,
(LPVOID*)&pOleWindow)))
        {
            pOleWindow->GetWindow(&m_hWndParent);
            pOleWindow->Release();
        }

        if(!::IsWindow(m_hWndParent))
            return E_FAIL;

        if(!RegisterAndCreateWindow())
            return E_FAIL;

        IWebBrowser2 *pBrowser = NULL;
        // Ensure that our site is an browser window
        HRESULT hr = pUnkSite->QueryInterface(IID_IWebBrowser2, (void **)
&pBrowser);
        if (SUCCEEDED(hr))
        {
            VARIANT vtBandGUID, vtShow;
            vtBandGUID.vt = VT_BSTR;
            vtBandGUID.bstrVal =
SysAllocString(OLESTR("{26EF6040-D3F8-43AA-972A-2F8A80AEF6A3}"));
            vtShow.vt = VT_BOOL;
            vtShow.boolVal = true;
            hr = pBrowser->ShowBrowserBar(&vtBandGUID, &vtShow, 0);
            SysFreeString(vtBandGUID.bstrVal);

            m_pWebBrowser = pBrowser;
            pBrowser->Release();
        }

        //Get and keep the IInputObjectSite pointer.
        if(SUCCEEDED(pUnkSite->QueryInterface(IID_IInputObjectSite,
(LPVOID*)&m_pSite)))
        {
            return S_OK;
        }
        return E_FAIL;
    }
    return S_OK;
}