MainPage.xaml

<?xml version="1.0" encoding="utf-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:local="clr-namespace:XamlFlags"
             x:Class="XamlFlags.MainPage"
             x:Name="Page">
    <ContentPage.BindingContext>
        <local:MainPageViewModel />
    </ContentPage.BindingContext>
    <StackLayout BindableLayout.ItemsSource="{Binding Options}">
        <BindableLayout.ItemTemplate>
            <DataTemplate>
                <Frame CornerRadius="4" Padding="0">
                    <StackLayout Orientation="Horizontal" Padding="5"
                                    BackgroundColor="White">
                        <StackLayout.Triggers>
                            <DataTrigger TargetType="StackLayout"
                                Binding="{Binding IsEnabled}"
                                Value="false">
                                <Setter Property="IsEnabled"
                                        Value="false" />
                            </DataTrigger>
                            <MultiTrigger TargetType="StackLayout">
                                <MultiTrigger.Conditions>
                                    <BindingCondition
                                            Binding="{Binding IsEnabled}"
                                            Value="false"/>
                                    <BindingCondition
                                        Binding="{Binding IsSelected}"
                                        Value="false"/>
                                </MultiTrigger.Conditions>
                                <Setter Property="BackgroundColor"
                                        Value="DarkGray" />
                            </MultiTrigger>
                            <MultiTrigger TargetType="StackLayout">
                                <MultiTrigger.Conditions>
                                    <BindingCondition
                                            Binding="{Binding IsEnabled}"
                                            Value="true"/>
                                    <BindingCondition
                                        Binding="{Binding IsSelected}"
                                        Value="true"/>
                                </MultiTrigger.Conditions>
                                <Setter Property="BackgroundColor"
                                    Value="DarkBlue" />
                            </MultiTrigger>
                        </StackLayout.Triggers>
                        <Button Text="Select"
                                Command="{Binding BindingContext.SelectTypeCommand, Source={x:Reference Page}}" 
                                CommandParameter="{Binding .}"/>
                        <Label Text="✓"
                                TextColor="White"
                                FontSize="12"
                                HorizontalOptions="EndAndExpand"
                                VerticalOptions="Center">
                            <Label.Triggers>
                                <DataTrigger TargetType="Label"
                                                Binding="{Binding IsSelected}"
                                                Value="False">
                                    <Setter Property="IsVisible"
                                            Value="False" />
                                </DataTrigger>
                            </Label.Triggers>
                        </Label>
                        <Label Text="{Binding Value}" TextColor="Black"
                                HorizontalOptions="EndAndExpand"
                                VerticalOptions="Center">
                            <Label.Triggers>
                                <MultiTrigger TargetType="Label">
                                    <MultiTrigger.Conditions>
                                        <BindingCondition
                                                Binding="{Binding IsEnabled}"
                                                Value="false"/>
                                        <BindingCondition
                                            Binding="{Binding IsSelected}"
                                            Value="false"/>
                                    </MultiTrigger.Conditions>
                                    <Setter Property="TextColor"
                                        Value="LightGray" />
                                </MultiTrigger>
                                <MultiTrigger TargetType="Label">
                                    <MultiTrigger.Conditions>
                                        <BindingCondition
                                                Binding="{Binding IsEnabled}"
                                                Value="true"/>
                                        <BindingCondition
                                            Binding="{Binding IsSelected}"
                                            Value="true"/>
                                    </MultiTrigger.Conditions>
                                    <Setter Property="TextColor"
                                        Value="White" />
                                </MultiTrigger>
                            </Label.Triggers>
                        </Label>
                    </StackLayout>
                </Frame>
            </DataTemplate>
        </BindableLayout.ItemTemplate>
    </StackLayout>
</ContentPage>

MainPageViewModel.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Windows.Input;
using Xamarin.Forms;
using Xamarin.Forms.Internals;

namespace XamlFlags
{
    public class MainPageViewModel : BindableBase
    {
        public ICommand SelectTypeCommand { get; }
        public List<OptionViewModel> Options { get; } = new List<OptionViewModel>
        {
            new OptionViewModel { Value = "Option 1-A", Category = "1", Variety = "A" },
            new OptionViewModel { Value = "Option 1-B", Category = "1", Variety = "B" },
            new OptionViewModel { Value = "Option 2-A", Category = "2", Variety = "A" },
            new OptionViewModel { Value = "Option 2-B", Category = "2", Variety = "B" },
            new OptionViewModel { Value = "Option 3-A", Category = "3", Variety = "A" },
            new OptionViewModel { Value = "Option 3-B", Category = "3", Variety = "B" },
        };

        public MainPageViewModel()
        {
            SelectTypeCommand = new Command<OptionViewModel>(OnSelectType);
            OnSelectType(Options.First());
        }

        private void OnSelectType(OptionViewModel option)
        {
            if (option is null) return;

            // reset all options
            Options.ForEach(o => { o.IsEnabled = false; o.IsSelected = false; });

            // enable options of the same variety (ie. A,B)
            Options.Where(o => o.Variety == option.Variety)
                .ForEach(o => { o.IsEnabled = true; });

            // enable options of the same category (ie. 1,2,3)
            Options.Where(o => o.Category == option.Category)
                .ForEach(o => { o.IsEnabled = true; });

            // select the current option
            option.IsSelected = true;
        }
    }

    public class OptionViewModel : BindableBase
    {
        public string Value { get; set; }
        public string Variety { get; set; }
        public string Category { get; set; }

        private bool _isEnabled;
        public bool IsEnabled { get => _isEnabled; set => SetProperty(ref _isEnabled, value); }

        private bool _isSelected;
        public bool IsSelected { get => _isSelected; set => SetProperty(ref _isSelected, value); }
    }

    public abstract class BindableBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        protected bool SetProperty<T>(ref T backingStore, T value, [CallerMemberName] string propertyName = null, Action onChanged = null, Action<T> onChanging = null)
        {
            if (EqualityComparer<T>.Default.Equals(backingStore, value))
                return false;

            onChanging?.Invoke(value);

            backingStore = value;

            onChanged?.Invoke();
            OnPropertyChanged(propertyName);

            return true;
        }
    }
}