<Window x:Class="Calendar.CalendarAndListBox"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="CalendarAndListBox" Height="300" Width="300">
    <StackPanel Orientation="Horizontal">
        <Calendar x:Name="calendar"
     SelectionMode="MultipleRange">
        </Calendar>
        <TextBlock VerticalAlignment="Center" HorizontalAlignment="Center" Text="{Binding ElementName=calendar, Path=SelectedDate}" />
        <ListBox  VerticalAlignment="Center" ItemsSource="{Binding ElementName=calendar, Path=SelectedDates}" />
    </StackPanel>

</Window>
