Why IExpando.AddMethod was not called?

Question

Hi,

I'm hosting my WinForms control in Internet Explorer. Additionally I've implemented IExpando interface to be able to emulate unexisted fields and methods in my C# code when javascript code try to access them. For example

var myobj = new ActiveXObject('server.object');
myobj.Foo = "FooText";
myobj.Bar("BarText");

Note that my C# class doesn't contain Foo field and Bar method. IExpando.AddField will be called with parameter name="Foo", but IExpando.AddMethod will not be executed. In case of myobj.Bar("BarText"); only IReflect.GetMethods, IReflect.GetProperties and IReflect.GetFields methods will be executed.

Does anyone knows why IExpando.AddMethod was not called?

Thanks, Paul.