A basic Popup
<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="Gray" Height="300" Width="400"> <Image x:Name="myImage" Source="http://server.com/man.png" /> <Popup x:Name="myPopup"> <Border CornerRadius="10" Background="Silver" BorderThickness="2" BorderBrush="Black"> <StackPanel Margin="10"> <TextBlock Text="This application uses Silverlight 2!" /> <Button x:Name="myButton" Height="30" Width="90" Content="Close" /> </StackPanel> </Border> </Popup> </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; namespace SilverlightApplication3 { public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); myButton.Click += new RoutedEventHandler(myButton_Click); myPopup.IsOpen = true; } void myButton_Click(object sender, RoutedEventArgs e) { myPopup.IsOpen = false; } } }