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    <ContentView.ControlTemplate>
        <ControlTemplate>
            <StackLayout
                BackgroundColor="#4f000000"
                HorizontalOptions="Fill"
                VerticalOptions="Fill">
                <Frame
                    Margin="15,25"
                    Padding="5"
                    Style="{StaticResource ModalStyle}"

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namespace XamarinModalExample.Controls
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class Modal : ContentView
    {
        public static readonly BindableProperty ShowModalProperty
            = BindableProperty.Create(nameof(ShowModal), typeof(bool), typeof(Modal), defaultValue: false, defaultBindingMode: BindingMode.TwoWay, propertyChanged: ShowModalPropertyChanged);
        public static readonly BindableProperty ModalHeaderProperty
            = BindableProperty.Create(nameof(ModalHeader), typeof(string), typeof(Modal), defaultValue: string.Empty, defaultBindingMode: BindingMode.TwoWay);

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<?xml version="1.0" encoding="utf-8" ?>
<ContentPage
    x:Class="XamarinModalExample.MainView"
    xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:controls="clr-namespace:XamarinModalExample.Controls;assembly=XamarinModalExample">

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    <Grid>
        <ScrollView Grid.Row="0">
            <StackLayout>
              <!-- main content here -->           
            </StackLayout>
        </ScrollView>

        <controls:Modal
            Grid.Row="0"
            ModalHeader="Help Text"

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public class MyConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        // do something to get a new value
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        // and change it back if you want to

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public class BooleanNegationConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return !(bool)value;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return !(bool)value;

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public class FirstValidationErrorConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            ICollection<string> errors = value as ICollection<string>;
            return errors != null && errors.Count > 0 ? errors.ElementAt(0) : null;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {

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public class ItemTappedEventArgsConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            var eventArgs = value as ItemTappedEventArgs;
            if (eventArgs == null)
                throw new ArgumentException("Expected TappedEventArgs as value", "value");

            return eventArgs.Item;
        }

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<ListView ItemsSource="{Binding ListData}" HasUnevenRows="True">
    <ListView.Behaviors>
        <behaviors:EventToCommandBehavior EventName="ItemTapped" Command="{Binding ListItemSelected}" EventArgsConverter="{StaticResource ItemTappedEventArgsConverter}" />
    </ListView.Behaviors>
    
    <ListView.ItemTemplate>
      <DataTemplate>
        <ViewCell>
          <!- your layout here-->
        </ViewCell>

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public class EventToCommandBehavior : BindableBehavior<Xamarin.Forms.View>
    {
        public static BindableProperty CommandProperty =
            BindableProperty.CreateAttached(
                "Command",
                typeof(ICommand),
                typeof(EventToCommandBehavior),
                null,
                BindingMode.OneWay);