UINT flags = RDW_INVALIDATE | RDW_ALLCHILDREN;
if ( eraseBack )
flags |= RDW_ERASE;
::RedrawWindow(hWnd, pRect, NULL, flags);
UINT flags = RDW_INVALIDATE | RDW_ALLCHILDREN;
if ( eraseBack )
flags |= RDW_ERASE;
::RedrawWindow(hWnd, pRect, NULL, flags);