WPF VB.Net

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="CommandEnabling" Height="300" Width="300"
    >
  
    
      
        
      
    
  


//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 System.Windows.Window
    Public Sub New()
      InitializeComponent()
      Dim redoCommandBinding As New CommandBinding(ApplicationCommands.Redo)
      AddHandler redoCommandBinding.CanExecute, AddressOf RedoCommandCanExecute
      CommandBindings.Add(redoCommandBinding)
    End Sub
    Private Sub RedoCommandCanExecute(sender As Object, e As CanExecuteRoutedEventArgs)
      e.CanExecute = DateTime.Now.Second Mod 2 > 1
    End Sub
  End Class
End Namespace