public RosterItem(
	Jid jid,
	string name = null,
	params string[] groups
)

Public Sub New ( 
	jid As Jid,
	Optional name As String = Nothing,
	ParamArray groups As String()
)

public:
RosterItem(
	Jid^ jid, 
	String^ name = nullptr, 
	... array<String^>^ groups
)

new : 
        jid : Jid * 
        ?name : string * 
        groups : string[] 
(* Defaults:
        let _name = defaultArg name null
*)
-> RosterItem