<Window x:Class="ContentRendered.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="ContentRendered" Height="300" Width="300" ContentRendered="OnContentRendered"> <Grid> </Grid> </Window> //File:Window.xaml.cs using System; using System.Collections.Generic; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Shapes; namespace ContentRendered { public partial class Window1 : System.Windows.Window { public Window1() { InitializeComponent(); } private void OnContentRendered(object sender, EventArgs e) { MessageBox.Show("Content Rendered Event Fired!"); } } }