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" 
             x:Class="NullableDatePicker.MainPage"
             xmlns:local="clr-namespace:NullableDatePicker.Controls" >
	<ContentPage.Content>
        <StackLayout VerticalOptions="CenterAndExpand" HorizontalOptions="FillAndExpand" Padding="20">
            <Label Text="Select Date:"/>
            <local:NullableDatePicker NullableDate="{Binding MyDate}" />
        </StackLayout>
	</ContentPage.Content>
</ContentPage>