Ooui-tws-port/Samples/DisplayAlertPage.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"
             x:Class="Samples.DisplayAlertPage">
    <ContentPage.Content>
        <StackLayout>
            <Label Text="Welcome to DisplayAlert Sample!" FontSize="32" FontAttributes="Bold" Margin="10,10,10,50"
                HorizontalOptions="Center"/>
            <ActivityIndicator x:Name="activity" />
            <ProgressBar x:Name="progress" />
            <DatePicker x:Name="datePicker" />
            <Button Text="Tap to Display Alert"
                    Clicked="OnButtonClicked" />
        </StackLayout>
    </ContentPage.Content>
</ContentPage>