kTopEdge
BGroupView((location & (kTopEdge | kBottomEdge)) != 0
location = kTopEdge;
location = kTopEdge;
case kTopEdge:
case kTopEdge:
case kTopEdge:
if ((location & (kTopEdge | kBottomEdge)) != 0)
return (location & (kTopEdge | kBottomEdge)) != 0