UI Element Mouse Clicked Events

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<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="WPF" Height="150" Width="300">
    <StackPanel>
        <Button Content="Click" Click="Button_Click"
                MaxHeight="25" MaxWidth="100" />
        <Label Background="LightBlue" Content="Double Click" 
               HorizontalContentAlignment="Center" 
               MaxHeight="25" MaxWidth="100" 
               MouseDoubleClick="Label_MouseDoubleClick" />
        <TextBlock Background="Turquoise" Text="Mouse Up" MouseUp="TextBlock_MouseUp" HorizontalAlignment="Center" VerticalAlignment="Center"/>
        <Canvas>
            <Rectangle Canvas.Top="15" Canvas.Left="20" Height="25" Width="100" Fill="Aqua" MouseDown="Rectangle_MouseDown" />
            <TextBlock Canvas.Top="20" Canvas.Left="40" Text="Mouse Down" IsHitTestVisible="False"/>            
        </Canvas>
    </StackPanel>
</Window>

//File:Window.xaml.cs

using System;
using System.Windows;
using System.Windows.Input;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            MessageBox.Show("Mouse Click", "Button");
        }

        private void Label_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            MessageBox.Show("Mouse Double Click", "Label");
        }

        private void Rectangle_MouseDown(object sender, MouseButtonEventArgs e)
        {
            MessageBox.Show("Mouse Down", "Rectangle");
        }

        private void TextBlock_MouseUp(object sender, MouseButtonEventArgs e)
        {
            MessageBox.Show("Mouse Up", "TextBlock");
        }
    }
}