public override View GetView(int position, View convertView, ViewGroup parent)
        {
            MasterAdapterHelper helper = null;
            if (convertView == null) {
                convertView = activity.LayoutInflater.Inflate (Android.Resource.Layout.SimpleListItem1, null);
                helper = new MasterAdapterHelper ();
                helper.Title = convertView.FindViewById<TextView> (Android.Resource.Id.Text1);
                convertView.Tag = helper;
            } else {
                helper = convertView.Tag as MasterAdapterHelper;
            }

            helper.Title.Text = items [position].ToString ();

            return convertView;
        }
        public override View GetView(int position, View convertView, ViewGroup parent)
        {
            MasterAdapterHelper helper = null;

            if (convertView == null)
            {
                convertView     = activity.LayoutInflater.Inflate(Android.Resource.Layout.SimpleListItem1, null);
                helper          = new MasterAdapterHelper();
                helper.Title    = convertView.FindViewById <TextView> (Android.Resource.Id.Text1);
                convertView.Tag = helper;
            }
            else
            {
                helper = convertView.Tag as MasterAdapterHelper;
            }

            helper.Title.Text = items [position].ToString();

            return(convertView);
        }