IDC_CHECK_RENEWABLE
ShowWindow(GetDlgItem(hDialog,IDC_CHECK_RENEWABLE),show);
CheckDlgButton(hDialog, IDC_CHECK_RENEWABLE, renew_till);
case IDC_CHECK_RENEWABLE:
if (IsDlgButtonChecked(hDialog, IDC_CHECK_RENEWABLE)) {
if (IsDlgButtonChecked(hDialog, IDC_CHECK_RENEWABLE)) {