Why can't I get the event handler of a LinkButton's event using reflection?

I want to access the event handler of a LinkButton's Command event, but the in the snippet bellow fieldInfo is null.

LinkButton button = new LinkButton();
button.Command += (s, e) => { };
Type type = button.GetType();
EventInfo[] eventInfos = type.GetEvents(BindingFlags.IgnoreCase | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static);
foreach (EventInfo eventInfo in eventInfos)
    if (eventInfo.Name == "Command")
    {
        // fieldInfo is null
        FieldInfo fieldInfo = eventInfo.DeclaringType.GetField(eventInfo.Name, BindingFlags.IgnoreCase | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static);
        Delegate delegates = (Delegate)fieldInfo.GetValue(button);
        foreach (Delegate handler in delegates.GetInvocationList())
        {
            eventInfo.RemoveEventHandler(button, handler);
            // or
            eventInfo.AddEventHandler(button, handler);
            // or do whatever with handler
        }
    }

Code snippet was inspired from this.

Why is fieldInfo null ?

Is there another way to get the event handler of a LinkButton's Command event ?

Also Hans Passant sollution does not work on LinkButton using Command as the field name.