[Boost-users] Boost Graph - Sub Graph Bundled Properties Error

Could someone explain with the code below generates an error? The code worked fine with a standard boost graph (ie not a subgraph<>)...... I can create the sub graph, but cannot access the bundled properties data: typedef adjacency_list > GraphType; typedef subgraph<GraphType> SubGraphType; SubGraphType SubGraph; SubGraphType::vertex_descriptor V = add_vertex(SubGraph); SubGraph[V].ID=1; ////ERROR!!!!!! Sincerely, John