private Tuple <IEnumerable <GraphAndUI <NodeUIData> >, IEnumerable <NodeGroup>, object, bool> ReadFromStream(IDataSource datasource, Stream m)
{
var deserializer = SerializationUtils.ConversationDeserializer(datasource);
var data = deserializer.Read(m);
var groups = data.EditorData.Groups;
return(Tuple.Create(data.Nodes, groups, data.DocumentId, m_shouldDuplicate));
}