How to use Calender Control

<UserControl x:Class="Calendar.Page"
xmlns="http://schemas.microsoft.com/client/2007"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:liquid="clr-namespace:Liquid;assembly=Liquid"
xmlns:extended="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls"
Width="400" Height="300">
<Canvas>
<extended:Calendar x:Name="testCal" Canvas.Top="10" Canvas.Left="10" />
</Canvas>
</UserControl>