Tabbed Page on iOS: how to check the click on the "more" button?

Hi,

When there are more than five items in a tabbed page (I tested the gallery one), iOS shows a "more" button. However, clicking it does nothing and I have not found a way to check it when it is clicked.
the documentation does not indicate a lot... http://iosapi.xamarin.com/?link=T:Xamarin.Forms.TabbedPage/*

Any suggestions?

public TabbedPageDemoPage()
{
this.Title = "TabbedPage";

            this.ItemsSource = new NamedColor[] 
            {
                new NamedColor("Red", Color.Red),
                new NamedColor("Yellow", Color.Yellow),
                new NamedColor("Green", Color.Green),
                new NamedColor("Aqua", Color.Aqua),
                new NamedColor("Blue", Color.Blue),
                new NamedColor("Purple", Color.Purple),
                new NamedColor("Olive", Color.Olive)

            };

            this.ItemTemplate = new DataTemplate(() => 
                { 
                    return new NamedColorPage(false); 
                });
        }

In the screenshot, you can see the button that doesn't click.
thanks!