protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            _persoon = Gegevens.GetPerson();
            _groep = Gegevens.CurrentGroup();

            SetContentView(Resource.Layout.Betaalscherm);

            _toolbar = FindViewById<Toolbar>(Resource.Id.toolbar);
            ImageView Avatar = _toolbar.FindViewById<ImageView>(Resource.Id.Avatar);
            TextView Title = _toolbar.FindViewById<TextView>(Resource.Id.Title);
            Title.Text = _groep.groepsnaam;

            foreach (var lid in _persoon.KrijgSchuldGroep(_groep))
            {
                deelnemers.Add(new ListItem(lid.Key, Resource.Drawable.iconn, lid.Value, _groep));
            }

            _adapter = new ListItemAdapter(ListItem.Session, deelnemers);
            _adapter.ItemClick += OnItemClick;
            _adapter.ItemLongClick += (sender, e) => {};

            _recyclerView = FindViewById<RecyclerView>(Resource.Id.recyclerview);
            _recyclerView.SetMinimumHeight(ConvertDptoPx(listItemHeight*deelnemers.Count));
            _recyclerView.SetLayoutManager(new LinearLayoutManager(this));
            _recyclerView.SetScrollContainer(true);
            _recyclerView.NestedScrollingEnabled = false;
            _recyclerView.SetAdapter(_adapter);

            SetSupportActionBar(_toolbar);
            SupportActionBar.Title = "";
            SupportActionBar.SetDisplayHomeAsUpEnabled(true);
            SupportActionBar.SetDisplayShowHomeEnabled(true);
        }
        private void MakeView(List<ListItem> _list, int state)
        {
            _adapter = new ListItemAdapter(state, _list);

            _recyclerView = FindViewById<RecyclerView>(Resource.Id.recyclerview);

            _recyclerView.SetMinimumHeight(ConvertDptoPx(listItemHeight*_list.Count));
            _recyclerView.SetLayoutManager(new LinearLayoutManager(this));

            _recyclerView.SetScrollContainer(true);
            _recyclerView.NestedScrollingEnabled = false;
            _recyclerView.SetAdapter(_adapter);

            SetSupportActionBar(_toolbar);
            SupportActionBar.Title = "";
            SupportActionBar.SetDisplayHomeAsUpEnabled(true);
            SupportActionBar.SetDisplayShowHomeEnabled(true);
        }