How to access data on map inside PacketExtension?

I am running a message listener implemented with Smack, when I am debuging with Eclipse console I can see that the extended data is sucessfuly parsed into a PacketExtension and the PacketExtension haves a map with all the data I need loaded into the map. The problem is there is no method to access the data of the map inside PacketExtension (something like getProperty(String propname) or getMap()).

Is this a bug? How can I access the data?