/// <summary>
/// Update this roster item with new presence information
/// </summary>
/// <param name="p"></param>
public void ChangePresence(Presence p)
{
this.SelectedImageIndex = this.ImageIndex = ItemNode.GetPresenceImage(p);
if (p == null || String.IsNullOrEmpty(p.Status))
{
this.Status = null;
}
else
{
this.Status = p.Status;
}
}
