think about the grid listeners of grid, it's so complicate that it's hard to maintain relationship  and status,I think it's necessary to arose an intermediate level to cope with this;
perhaps like this:

//somewhere in A.hpp ...
Grid A("guid_a");
//somewhere else in B.hpp
Grid B("guid_b");
//somewhere else in C.hpp
Form c("guid_c");

A.AddListener("guid_b");      //why use string but not directly object pointer? because perhaps listeners is not yet valid at this runtime, this is just a registeration work
A.AddListener("guid_c");

//cope with the code when A select a row:
GridListenerHandler handler(A);
handler.HandleListeners();

//how to handle? like follow:
Context context = ...;
BOOST_FOREACH(shared_ptr<IListener> listener, InnerGetListeners())
{
       listener->Execute(context);
}