RefreshRect(wxRect(0, rc.top, rc.left, height), false);
RefreshRect(wxRect(0, rc.bottom, widthNbook, heightNbook - rc.bottom),
false);
RefreshRect(wxRect(0, rc.top, rc.left, height), false);
RefreshRect(wxRect(0, rc.bottom, widthNbook, heightNbook - rc.bottom),
false);