Create Jabber.net Gtalk Client with C # WPF

Hello,
I am creating a client using Jabber.Net Gtlak, Google Contacts API in C # WPF.

I am using to guide your article: Google Chat Desktop Application using Jabber.Net.

The main problem is That I Can add the Control RosterTree my WPF application to load the contacts and the Presence thereof.

The solution I've Chosen is to try to simulate the controlling RosterTree.

To add contacts When launching the event OnRosterItem insert it into a listbox or other monitoring of type list. So far everything works fine, the problem Also Appears When I insert the contact state contact, Whether it is online, offline, unavailable or absent ...

Within the event OnRosterItem insert contacts When a property can not find the item you return me the contact state to add to the list.

My questions are:
1 - can be inserted in a WPF application RosterTree Control? if yes, please tell me how?
2 - How I can retrieve the status of a contact? is an event?

Thanks for the help. Sorry for my english!
Rubén