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Loading some XAML at runtime

<UserControl x:Class='SilverlightApplication3.MainPage'     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'      mc:Ignorable='d'      d:DesignWidth='640'      d:DesignHeight='480'>     <Grid x:Name="LayoutRoot" Background="White" Margin="10">         <StackPanel Orientation="Vertical">             <Button x:Name="myButton" Content="Create Rectangle" Height="30" Width="120" Click="myButton_Click" />             <Canvas x:Name="myCanvas"></Canvas>         </StackPanel>     </Grid> </UserControl> //File: Page.cs using System; using System.Collections.Generic; using System.Linq; using System.Net; using System.Windows; using System.Windows.Controls; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Animation; using System.Windows.Shapes; using System.Windows.Markup; namespace SilverlightApplication3 {     public partial class MainPage : UserControl     {         public MainPage()         {             InitializeComponent();         }         private void myButton_Click(object sender, RoutedEventArgs e)         {             string xaml = "<Rectangle xmlns=\"http://schemas.microsoft.com/winfx/2006/xaml/presentation\" Height=\"60\" Width=\"20\" Fill=\"Blue\" />";               Rectangle rectangle = (Rectangle) XamlReader.Load(xaml);              myCanvas.Children.Add(rectangle);              }     } }