public ActivityPage(Activity act)
        {
            theAct = act;
            Title = act.FullName;
            fullDescription = string.Format ("{0}, worth {1} points", act.FullName, act.Score);
            Label subTitle = new Label () {
                FontAttributes = FontAttributes.Italic,
                HorizontalOptions = LayoutOptions.CenterAndExpand,
            };
            if (act.OneTimeOnly) {
                subTitle.Text = string.Format ("Worth {0} points (one time only)", act.Score);
            } else {
                subTitle.Text = string.Format ("Worth {0} points (each)", act.Score);
            }

            var listTemplate = new DataTemplate (() => {
                var cell = new TextCell ();
                cell.SetBinding<Task> (TextCell.TextProperty, t => t.DT);
                cell.SetBinding<Task> (TextCell.DetailProperty, t => t.Notes);
                return cell;
            });

            // There might be multiple task-completions here, so use a scrolling ListView
            listCurrentTasks = new ListView ();
            listCurrentTasks.ItemTemplate = listTemplate;
            listCurrentTasks.ItemSelected += HandleSelect;

            // There might be multiple task-completions here, so use a scrolling ListView
            listTaskHistory = new ListView ();
            listTaskHistory.ItemTemplate = listTemplate;
            listTaskHistory.ItemSelected += HandleSelect;

            btnAdd = new Button () { Text = "Tap to Record Completion", BorderWidth = 2, };
            btnAdd.Clicked += HandleAdd;

            var layout = new StackLayout ();
            layout.Children.Add (subTitle);
            layout.Children.Add (btnAdd);
            tapToDeleteOrUpdate = new Label { Text = "Tap below to Delete or Add Notes", TextColor = Color.Teal, };
            tapToDeleteOrUpdate.IsVisible = false;
            layout.Children.Add (tapToDeleteOrUpdate);

            layout.Children.Add (listCurrentTasks);
            var lineSeparator = new BoxView () { Color = Color.Blue, WidthRequest = 100, HeightRequest = 8 };
            layout.Children.Add (lineSeparator);
            layout.Children.Add (new Label { Text = "History (not included in current score):", TextColor = Color.Teal, });
            layout.Children.Add (listTaskHistory);
            //layout.HorizontalOptions = LayoutOptions.Center;
            Content = layout;
        }
        public ActivityPage(Activity act)
        {
            theAct          = act;
            Title           = act.FullName;
            fullDescription = string.Format("{0}, worth {1} points", act.FullName, act.Score);
            Label subTitle = new Label()
            {
                FontAttributes    = FontAttributes.Italic,
                HorizontalOptions = LayoutOptions.CenterAndExpand,
            };

            if (act.OneTimeOnly)
            {
                subTitle.Text = string.Format("Worth {0} points (one time only)", act.Score);
            }
            else
            {
                subTitle.Text = string.Format("Worth {0} points (each)", act.Score);
            }

            var listTemplate = new DataTemplate(() => {
                var cell = new TextCell();
                cell.SetBinding <Task> (TextCell.TextProperty, t => t.DT);
                cell.SetBinding <Task> (TextCell.DetailProperty, t => t.Notes);
                return(cell);
            });

            // There might be multiple task-completions here, so use a scrolling ListView
            listCurrentTasks = new ListView();
            listCurrentTasks.ItemTemplate  = listTemplate;
            listCurrentTasks.ItemSelected += HandleSelect;

            // There might be multiple task-completions here, so use a scrolling ListView
            listTaskHistory = new ListView();
            listTaskHistory.ItemTemplate  = listTemplate;
            listTaskHistory.ItemSelected += HandleSelect;

            btnAdd = new Button()
            {
                Text = "Tap to Record Completion", BorderWidth = 2,
            };
            btnAdd.Clicked += HandleAdd;

            var layout = new StackLayout();

            layout.Children.Add(subTitle);
            layout.Children.Add(btnAdd);
            tapToDeleteOrUpdate = new Label {
                Text = "Tap below to Delete or Add Notes", TextColor = Color.Teal,
            };
            tapToDeleteOrUpdate.IsVisible = false;
            layout.Children.Add(tapToDeleteOrUpdate);

            layout.Children.Add(listCurrentTasks);
            var lineSeparator = new BoxView()
            {
                Color = Color.Blue, WidthRequest = 100, HeightRequest = 8
            };

            layout.Children.Add(lineSeparator);
            layout.Children.Add(new Label {
                Text = "History (not included in current score):", TextColor = Color.Teal,
            });
            layout.Children.Add(listTaskHistory);
            //layout.HorizontalOptions = LayoutOptions.Center;
            Content = layout;
        }