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Version: 188.8.131.52 (Visual Studio Enterprise)
`NSMenu.IndexOfItem(NSObject target, Selector actionSelector)` appears to be bound incorrectly. Apple documentation says that `target` can be `nil`, but if I pass `null` along with any non-null selector, an ArgumentNullException is raised for the `target` parameter.
Try the following in a Mac workbook to reproduce:
NSApplication.SharedApplication.MainMenu.IndexOfItem (null, new ObjCRuntime.Selector("quit:"))
Merged in master https://github.com/xamarin/xamarin-macios/commit/0443d380280ad8a3ba012f51dab0af790ebcf56b
The reason you're getting the NullReferenceException there is because at the point you're trying to call NSApplication.SharedApplication.MainMenu.IndexOfItem in the Main method there, MainMenu is still null (So you're trying to call a method on a null object). If you move your call into the AppDelegate's DidFinishLaunching method, it works fine.