<Window x:Class="RoutedEvents.Focus" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Focus" Height="250" Width="300"> <StackPanel Margin="5"> <Button Margin="5" Padding="30" Name="cmdFocus">Focused</Button> <Button Margin="5" Padding="30">Not Focused</Button> </StackPanel> </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 RoutedEvents { public partial class Focus : System.Windows.Window { public Focus() { InitializeComponent(); } protected override void OnActivated(EventArgs e) { base.OnActivated(e); cmdFocus.Focus(); } } }