UWP: Xamarin Forms Tabbed Page changing page doesn't call OnAppearing - tabs

Question

In a Xamarin Forms project, I have created a TabbedPage inside which I have added 5 child navigation pages.
{
Children.Add(new NavigationPage(new A()));
Children.Add(new NavigationPage(new B()));
Children.Add(new NavigationPage(new C()));
Children.Add(new NavigationPage(new D()));
Children.Add(new NavigationPage(new E()));
}
When I click manually on a tab B from Tab A; B's OnAppearing method is called as expected. However when I programmatically change the tab using
tabbedPage.CurrentPage = tabbedPage.Children[index]
Then B's OnAppearing method is called never. This is happening on UWP.

Answer 1

As of Xamarin Forms 3.4.0.1008975 and UWP 6.1.5 this still appears to be an issue. I solved it like this:
Make an interface called IAppearable:
internal interface IAppearable
{
void HandleAppearing();
}
Have your content page implement this interface:
public partial class MyContentPage : ContentPage, IAppearable
In HandleAppearing do what you would have done in OnAppearing:
public void HandleAppearing()
{
// do appearing stuff here
}
After you programmatically set your tab page use this code:
CurrentPage = Children[pageIndex];
if (Device.RuntimePlatform == Device.UWP)
{
if (CurrentPage is IAppearable appearablePage)
{
appearablePage.HandleAppearing();
}
}