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Using CommandBinding and ExecutedRoutedEventHandler to bind Application event to an event handler method

<Window x: Class="WpfApplication1.Window1"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="CommandBasics" Height="300" Width="300">   <Grid>     <Button Command="ApplicationCommands.Properties" Content="_Properties"/>   </Grid> </Window> //File:Window.xaml.vb Imports System Imports System.Collections.Generic Imports System.Text Imports System.Windows Imports System.Windows.Controls Imports System.Windows.Data Imports System.Windows.Documents Imports System.Windows.Input Imports System.Windows.Media Imports System.Windows.Media.Imaging Imports System.Windows.Shapes Namespace WpfApplication1   Public Partial Class Window1     Inherits Window     Public Sub New()       InitializeComponent()       Dim cb As New CommandBinding(ApplicationCommands.Properties)       AddHandler cb.Executed, New ExecutedRoutedEventHandler(AddressOf cb_Executed)       Me.CommandBindings.Add(cb)     End Sub     Private Sub cb_Executed(sender As Object, e As ExecutedRoutedEventArgs)       MessageBox.Show("Properties")     End Sub   End Class End Namespace