Cannot see _ (underscore) in WPF content

Question

A very simple question:

Why I cant see _ (underscore) in WPF content?

For instance the content of

Answer 1

I was binding to a data source which I didn't want to change, so I used a custom converter to create the missing underscore:

[ValueConversion(typeof(string), typeof(string))]
public class ShowUnderscoreConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture) =>
        value is string text ? text.Replace("_", "__") : null;

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) => 
        value is string text ? text.Replace("__", "_") : null;
}