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Bind the command to the event handlers with CommandBindings

using System; using System.Windows; using System.Windows.Controls; using System.Windows.Input; using System.Windows.Media;     public class MainClass : Window     {         [STAThread]         public static void Main()         {             Application app = new Application();             app.Run(new MainClass());         }         public MainClass()         {             Button btn = new Button();             btn.HorizontalAlignment = HorizontalAlignment.Center;             btn.VerticalAlignment = VerticalAlignment.Center;             btn.Command = ApplicationCommands.Paste;             btn.Content = ApplicationCommands.Paste.Text;             Content = btn;             CommandBindings.Add(new CommandBinding(ApplicationCommands.Paste,PasteOnExecute, PasteCanExecute));         }         void PasteOnExecute(object sender, ExecutedRoutedEventArgs args)         {             Title = Clipboard.GetText();         }         void PasteCanExecute(object sender, CanExecuteRoutedEventArgs args)         {             args.CanExecute = Clipboard.ContainsText();         }         protected override void OnMouseDown(MouseButtonEventArgs args)         {             base.OnMouseDown(args);             Title = "title";         }     }