_BMCFilter_
class _BMCFilter_ : public BMessageFilter {
_BMCFilter_(BMenuField* menuField, uint32 what);
virtual ~_BMCFilter_();
_BMCFilter_& operator=(const _BMCFilter_&);
_BMCFilter_::_BMCFilter_(BMenuField* menuField, uint32 what)
_BMCFilter_::~_BMCFilter_()
_BMCFilter_::Filter(BMessage* message, BHandler** handler)
fMenuBar->AddFilter(new _BMCFilter_(this, B_MOUSE_DOWN));
fMenuBar->AddFilter(new _BMCFilter_(this, B_MOUSE_DOWN));