void PerformRemoveUser(KiiUser user)
    {
        message       = "Removing user...";
        ButtonEnabled = false;

        currentGroup.RemoveUser(user);
        currentGroup.Save((KiiGroup group, Exception e) =>
        {
            ButtonEnabled = true;
            if (e != null)
            {
                message = "Failed to remove user " + e.ToString();
                return;
            }
            message = "Remove user succeeded";
        });
    }