Use Mouse.Capture to let a Control capture an event

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<Window x:Class="RoutedEvents.MousePosition"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MousePosition" Height="300" Width="300">
  <StackPanel>
    <Rectangle Name="rect" MouseMove="MouseMoved" Fill="LightBlue" ></Rectangle>
    <Button Name="cmdCapture" Click="cmdCapture_Click">Capture the Mouse</Button>
    <TextBlock Name="lblInfo"></TextBlock>
  </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 MousePosition : System.Windows.Window
    {
        public MousePosition()
        {
            InitializeComponent();
        }
        private void cmdCapture_Click(object sender, RoutedEventArgs e)
        {
            this.AddHandler(Mouse.LostMouseCaptureEvent,new RoutedEventHandler(this.LostCapture));
            Mouse.Capture(rect);

            cmdCapture.Content = "Mouse captured";
        }

        private void MouseMoved(object sender, MouseEventArgs e)
        {
            Point pt = e.GetPosition(this);
            lblInfo.Text = String.Format("({0},{1}) in window coordinates",pt.X, pt.Y);            
        }

        private void LostCapture(object sender, RoutedEventArgs e)
        {
            lblInfo.Text = "Lost capture";
            cmdCapture.Content = "Capture the Mouse";
        }
    }
}