MFC does double buffering but everything else flickers

Question

MFC does double buffering but everything else flickers

I think the drawing no longer flickers now, so I think it works,

But I also have one toolbar and one status line, which now began to flicker very much.

Is there any way to fix this?

BOOL CPaintDlg::OnEraseBkgnd(CDC* pDC) // redraw the background colors
{
    return true;
}

void CPaintDlg::OnPaint()
{
   CRect rcClient;
   GetClientRect(rcClient); 

   CDC MemDC, *pDC;
   CBitmap MemBitmap;

   pDC = this->GetDC();         // Get Current DC
   MemDC.CreateCompatibleDC(pDC);
   MemBitmap.CreateCompatibleBitmap(pDC, rcClient.right, rcClient.bottom);

   CBitmap *pOldBitmap = (CBitmap*)MemDC.SelectObject(&MemBitmap);

   MemDC.FillSolidRect(0, 0, rcClient.right, rcClient.bottom, RGB(255, 255, 255));

   for (int i = 0; i < myShapes.GetSize(); ++i)
       myShapes[i]->draw(&MemDC);

   pDC->BitBlt(0, 0, rcClient.right, rcClient.bottom, &MemDC, 0, 0, SRCCOPY);
   MemDC.SelectObject(pOldBitmap);

   ReleaseDC(pDC);
   ReleaseDC(&MemDC);

   CDialogEx::OnPaint();
}