ResizeBorderState
ResizeBorderState(DefaultWindowBehaviour& behavior, BPoint where,
ResizeBorderState(DefaultWindowBehaviour& behavior, BPoint where,
fBehavior._NextState(new (std::nothrow) ResizeBorderState(fBehavior,
_NextState(new (std::nothrow) ResizeBorderState(*this, where,
struct ResizeBorderState;
friend struct ResizeBorderState;