gistfile1.txt

foreach (var child in tabbedPage.Children)
{
    if (child.GetType() == selectedTabType)
    {
        tabbedPage.CurrentPage = child;
        break;
    }
    else if(child is NavigationPage navPage && 
        (navPage.CurrentPage == selectedTabType || navPage.RootPage == selectedTabType))
    {
        if(tabbedPage.Children.Where(x => x.GetType() == selectedTabType).Count() > 1)
            throw new AmbiguousException();
            
        tabbedPage.CurrentPage = child;
        break;
    }
}