How can I do a similar operation in WPF?

    class BooleanToContentConverter : IValueConverter
{
    public string TrueContent { get; set; }
    public string FalseContent { get; set; }

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return (bool)value ? TrueContent : FalseContent;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

    <Page.Resources>
    <conv:BooleanToContentConverter x:Key="StateContent" TrueContent="Pause" FalseContent="Play"/>
</Page.Resources>

I haven't tried it this way, but the contents of all objects change at the same time.