Assign ApplicationCommands.Open to Button

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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="CommandHandlerProcedural"
    >
</Window>
//File:Window.xaml.cs

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;

namespace WpfApplication1
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
            
            StackPanel MainStackPanel = new StackPanel();
            this.AddChild(MainStackPanel);

            Button CommandButton = new Button();
            CommandButton.Command = ApplicationCommands.Open;
            CommandButton.Content = "Open (KeyBindings: Ctrl-R, Ctrl-0)";
            MainStackPanel.Children.Add(CommandButton);

            CommandBinding OpenCmdBinding = new CommandBinding(ApplicationCommands.Open,OpenCmdExecuted,OpenCmdCanExecute);

            this.CommandBindings.Add(OpenCmdBinding);

            KeyBinding OpenCmdKeyBinding = new KeyBinding(ApplicationCommands.Open,Key.R,ModifierKeys.Control);

            this.InputBindings.Add(OpenCmdKeyBinding);
        }

        void OpenCmdExecuted(object target, ExecutedRoutedEventArgs e)
        {
            MessageBox.Show("The command has been invoked.");
        }

        void OpenCmdCanExecute(object sender, CanExecuteRoutedEventArgs e)
        {
            e.CanExecute = true;
        }
    }
}