Open ActionSheet in DialogViewController?

I am implementing this in my DialogViewController: http://docs.xamarin.com/recipes/ios/standard_controls/actionsheet/display_an_actionsheet/

but on the line actionSheet.ShowInView(View); it throws an exception:

"Objective-C Exception thrown. Name: NSInvalidArgumentException Reason: Sheet can not be presented because the view is not in a window...etc"

can I not use ActionSheets in Monotouch dialog?

I tried passing this.TableView, same exception...

Pls help.