/// <summary>
/// Modifies the roster item to look like the given roster item.
/// This does not modify the model,
/// but waits for roster pushes from the XMPP server.
/// </summary>
/// <param name="item">Roster item that will appear in the roster.</param>
public void Modify(Item item)
{
RosterIQ iq = new RosterIQ(m_stream.Document);
iq.Type = IQType.set;
Roster r = iq.Instruction;
r.AddChild(item);
Write(iq); // ignore response
}
