How to get a MenuItem from within its CanExecute handler?

Question

How can I get access to the related MenuItem? It has been created on the fly, so I cannot just use it by a name in the xaml file.

private void menuItem_canExecute(object sender, CanExecuteRoutedEventArgs e)
{
    var snd = sender; // This is the main window
    var orgSource = e.OriginalSource; // This is a RichTextBox;
    var src = e.Source; // This is a UserControl

    // I think I must use the Command, but how?
    RoutedCommand routedCommand = e.Command as RoutedCommand;
}

Answer 1

You can always pass the commanding UI element to a command by binding itself to its CommandParameter property, like

<MenuItem ... CommandParameter="{Binding RelativeSource={RelativeSource Self}}"/>

Now you can access the MenuItem by the Parameter property of the CanExecuteRoutedEventArgs:

private void menuItem_canExecute(object sender, CanExecuteRoutedEventArgs e)
{
    var menuItem = e.Parameter as MenuItem;
    ...
}