Boolean CommandParameter in XAML

Question

I have this code (which works just right):

Answer 1

I just found an even more generic solution with this markup extension:

public class SystemTypeExtension : MarkupExtension
{
    private object parameter;

    public int Int{set { parameter = value; }}
    public double Double { set { parameter = value; } }
    public float Float { set { parameter = value; } }
    public bool Bool { set { parameter = value; } }
    // add more as needed here

    public override object ProvideValue(IServiceProvider serviceProvider)
    {
        return parameter;
    }
}

Usage ("wpf:" is the namespace where the extension lives in):

You even get the options True and False after typing Bool= and type safety!