WPF Calendar and DatePicker

<Window x:Class="WpfApp407.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp407"
        mc:Ignorable="d"
        WindowState="Maximized"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Calendar Grid.Column="0" BorderBrush="Blue" BorderThickness="3"
                  IsHitTestVisible="True" />
        <DatePicker Grid.Column="1" BorderBrush="Blue" BorderThickness="3" 
                    IsDropDownOpen="True"/>
    </Grid>
</Window>