RoutedEvents: Focus event

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<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();
        }
    }
}