[Mono-osx] how override an Objective C method?

[Eric Slosser]

I have a C# class which is subclassed from MonoMac.AppKit.NSWindowController.

I want to override +(bool)[NSObject respondsToSelector:sel].

My best guess is this, but the app crashes inside the call to the base method.

	[Export("respondsToSelector:")]
	public override bool RespondsToSelector (Selector sel)
	{
		bool result = base.RespondsToSelector(sel);
		return result;
	}