[Boost-users] [multi_index] multi index container with Managed C++

I am having trouble while using multi index container with the "managed c++" component. Here is the typedef that the compiler won't accept. typedef multi_index_container< gcroot<interface_entity*>, indexed_by< ordered_unique<identity<gcroot<interface_entity*> > >, ordered_non_unique<member<gcroot<interface_entity*>, int,&interface_entity::entity_drawingid> >,

entity_collection;

The real deal is with the member template which needs the address of member variable of the interface_entity class. Entity class is an abstract Managed type (specified with __gc), and it is not allowed to take the address of a non-static member of a managed type. Does anybody know of a workaround? Thanks Parag