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Help command

<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         x:Class="AboutDialog"         Title="About WPF Unleashed" SizeToContent="WidthAndHeight"         Background="OrangeRed">   <Window.CommandBindings>     <CommandBinding Command="Help" CanExecute="HelpCanExecute" Executed="HelpExecuted"/>   </Window.CommandBindings>   <StackPanel>     <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">       <Button MinWidth="75" Margin="10" Command="Help" Content="{Binding RelativeSource={RelativeSource Self}, Path=Command.Text}"/>       <Button MinWidth="75" Margin="10">OK</Button>     </StackPanel>     <StatusBar>asdf</StatusBar>   </StackPanel> </Window> //File:Window.xaml.vb Imports System.Windows Imports System.Windows.Input Public Partial Class AboutDialog   Inherits Window   Public Sub New()     InitializeComponent()   End Sub   Private Sub HelpCanExecute(sender As Object, e As CanExecuteRoutedEventArgs)     e.CanExecute = True   End Sub   Private Sub HelpExecuted(sender As Object, e As ExecutedRoutedEventArgs)     System.Diagnostics.Process.Start("http://www.rntsoft.com")   End Sub End Class