How to use OnKeyDown in a tab page in Xamarin Forms

Hello,

I have created a Xamarin Forms project in Visual Studio 2019. Used project template is contains tabs.

That works but I need to do some task when a key is pressed.

That task should be done by a page because it accesses some data that only exist in tab page content.

This is the MainPage.xaml:

<?xml version="1.0" encoding="utf-8" ?>
<TabbedPage xmlns="http://xamarin.com/schemas/2014/forms"
            xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
            xmlns:views="clr-namespace:FinningApp.Views"
            x:Class="FinningApp.Views.MainPage">

    <TabbedPage.Children>
        <NavigationPage Title="Capturas">
            <NavigationPage.Icon>
                <OnPlatform x:TypeArguments="FileImageSource">
                    <On Platform="iOS" Value="tab_feed.png"/>
                </OnPlatform>
            </NavigationPage.Icon>
            <x:Arguments>
                <views:ItemsPage />
            </x:Arguments>
        </NavigationPage>

        <NavigationPage Title="Acerca de">
            <NavigationPage.Icon>
                <OnPlatform x:TypeArguments="FileImageSource">
                    <On Platform="iOS" Value="tab_about.png"/>
                </OnPlatform>
            </NavigationPage.Icon>
            <x:Arguments>
                <views:AboutPage />
            </x:Arguments>
        </NavigationPage>
    </TabbedPage.Children>

</TabbedPage>

The page that should receive the OnKeyDown is ItemsPage whose definition is this:

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             x:Class="FinningApp.Views.ItemsPage"
              Title="{Binding Title}"
             x:Name="BrowseItemsPage">

    <StackLayout>
        <Button x:Name="ReadTags"
                Text="Leer Códigos"
                BackgroundColor="Green"
                TextColor="White"
                FontAttributes="Bold"
                VerticalOptions="Start"
                HorizontalOptions="Fill"
                Clicked="ReadTags_Clicked" />

        <ListView x:Name="ItemsListView"
                ItemsSource="{Binding Items}"
                VerticalOptions="FillAndExpand"
                HasUnevenRows="true"
                RefreshCommand="{Binding LoadItemsCommand}"
                IsPullToRefreshEnabled="true"
                IsRefreshing="{Binding IsBusy, Mode=OneWay}"
                CachingStrategy="RecycleElement"
                ItemSelected="OnItemSelected">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <ViewCell>
                        <StackLayout Padding="10">
                            <Label Text="{Binding Id}" 
                                LineBreakMode="NoWrap" 
                                Style="{DynamicResource ListItemTextStyle}" 
                                FontSize="16" />
                            <Label Text="{Binding Text}" 
                                LineBreakMode="NoWrap"
                                Style="{DynamicResource ListItemDetailTextStyle}"
                                FontSize="13" />
                        </StackLayout>
                    </ViewCell>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>
    </StackLayout>

</ContentPage>

I have seen that OnKeyDown exists only in MainActivity.

How can I accomplish this?

Regards
Jaime