RoutedEvents: Button Mouse Up Event

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<Window x:Class="RoutedEvents.ButtonMouseUpEvent"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="RoutedEvents" Height="300" Width="300">
    <Grid Margin="5">
      <Button Name="cmd" Click="ButtonClick" MouseUp="ButtonMouseUp">Click me.</Button>
    </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 RoutedEvents
{
    public partial class ButtonMouseUpEvent : System.Windows.Window
    {
        public ButtonMouseUpEvent()
        {
            InitializeComponent();
            cmd.AddHandler(Button.MouseUpEvent, new RoutedEventHandler(Backdoor), true);
        }
        
        private void ButtonClick(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("The Button.Click event occurred.");
        }

        private void ButtonMouseUp(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("mouse up.");
        }

        private void Backdoor(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("The (handled) Button.MouseUp event occurred.");
        }


    }
}