This method is called only if you
implemented IwodXMPPNotify interface in your application,
and wodXMPP.Notification
property has received reference to
instance of your implementation.
This notification method is called when list of all
available chat rooms has arrived - for one of the services.
This notification can be called more than once, if there is
more than one service available on the server that provide
chat rooms (such as if you have IRC gateway, MSN gateway
etc..)