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Detect whether the mouse button is pressed or released using the MouseButtonState property

<Window x:Class="WpfApplication1.Window1"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="DetectMouseButtonState" Height="400" Width="400">   <StackPanel Height="100" Width="100"        MouseLeftButtonDown="HandleButtonDown"        MouseLeftButtonUp="HandleButtonDown"        Background="Red"       DockPanel.Dock="Left">     <TextBlock>Click on Me</TextBlock>   </StackPanel> </Window> //File:Window.xaml.cs using System; using System.Windows; using System.Windows.Controls; using System.Windows.Media; using System.Windows.Input; namespace WpfApplication1 {     public partial class Window1 : Window     {         public Window1()         {             InitializeComponent();         }         void HandleButtonDown(object sender, MouseButtonEventArgs e)         {             StackPanel sourceStackPanel = e.Source as StackPanel;             if (e.ButtonState == MouseButtonState.Pressed)             {                 sourceStackPanel.Width = 200;                 sourceStackPanel.Height = 200;             }else if (e.ButtonState == MouseButtonState.Released)             {                 sourceStackPanel.Width = 100;                 sourceStackPanel.Height = 100;             }         }     } }