directshow play mp4, display isn't normal.

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directshow

I'm just use directshow for some days, I directly use MPC-BE filters.
After input file name,then click play button:

void CAFPlayerDlg::OnBnClickedButtonPlay()
{
    HRESULT hr = NOERROR;
    CString fileName;
    m_edtFileName.GetWindowTextW(fileName);

    if(fileName.GetLength() <= 0)
        return;

    hr = m_pGraph->RenderFile(fileName.GetBuffer(), NULL);
    fileName.ReleaseBuffer();

    if(FAILED(hr))
        return;

    hr = m_pME->SetNotifyWindow((OAHWND)this->GetSafeHwnd(), WM_GRAPHNOTIFY, 0);
    SetDisplayWindow(m_stcVideoWindow.GetSafeHwnd());

    if(SUCCEEDED(hr)) {
        m_pMC->Run();
    }
}

SetDisplayWindow function is:

bool CAFPlayerDlg::SetDisplayWindow( HWND displayWindow )
{
    if(m_pVideoWindow) {
        m_pVideoWindow->put_Visible(OAFALSE);
        m_pVideoWindow->put_Owner((OAHWND)displayWindow);

        RECT rect;
        ::GetClientRect(displayWindow, &rect);
        m_pVideoWindow->put_Left(0);
        m_pVideoWindow->put_Top(0);
        m_pVideoWindow->put_Width(rect.right - rect.left);
        m_pVideoWindow->put_Height(rect.bottom - rect.top);
        m_pVideoWindow->put_WindowStyle(WS_CHILD | WS_CLIPCHILDREN | WS_CLIPSIBLINGS); 

        m_pVideoWindow->put_MessageDrain((OAHWND)displayWindow);

        if(displayWindow) {
            m_pVideoWindow->put_Visible(OATRUE);
        } else {
            m_pVideoWindow->put_Visible(OAFALSE);
        }

        return true;
    }

    return false;
}

I has add some code for refreshing:

BOOL CAFPlayerDlg::OnInitDialog()
{
    CDialogEx::OnInitDialog();

    m_stcVideoWindow.ModifyStyle(0, WS_CLIPCHILDREN);

    CoInitialize(NULL);
    
    return TRUE;
}

BOOL CAFPlayerDlg::OnEraseBkgnd(CDC* pDC)
{
    CRect rc;
    // Get the bounding rectangle for the movie screen
    m_stcVideoWindow.GetWindowRect(&rc);
    ScreenToClient(&rc);
    // Exclude the clipping region occupied by our movie screen
   pDC->ExcludeClipRect(&rc);

    // Erase the remainder of the dialog as usual
    return CDialog::OnEraseBkgnd(pDC);
}

void CAFPlayerDlg::PreSubclassWindow()
{
    CDialog::PreSubclassWindow();
    this->ModifyStyle( 0, WS_CLIPCHILDREN | WS_CLIPSIBLINGS, 0 );
}

Now I can play mp4 file, I can hear music sound, but display is not normal.
Please see image:
[https://drive.google.com/file/d/0BwyCt3NztyAPZFdkM2N3ZnoyczQ/edit?usp=sharing[^]]