UpperSibling
for (Layer *lay = BottomChild(); lay; lay = UpperSibling())
for (Layer *lay = BottomChild(); lay; lay = UpperSibling()) {
for (Layer *lay = BottomChild(); lay; lay = UpperSibling()) {
for (Layer *lay = BottomChild(); lay; lay = UpperSibling())
for (Layer *lay = BottomChild(); lay; lay = UpperSibling()) {
for (Layer *child = BottomChild(); child; child = UpperSibling())
for (Layer *child = BottomChild(); child; child = UpperSibling())
Layer* UpperSibling() const;
for (Layer *child = lay->BottomChild(); child; child = lay->UpperSibling())
for (Layer *child = lay->BottomChild(); child; child = lay->UpperSibling())