Command Enabling
<Window x:Class="WpfApplication1.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="CommandEnabling" Height="300" Width="300" > <Grid> <Menu VerticalAlignment="Top"> <MenuItem Header="_Edit"> <MenuItem Command="Redo" /> </MenuItem> </Menu> </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 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