Hi Ivan,
I see that you opened a support ticket for the same question and my colleague has replied. I will share the reason you're having that problem, along with the solution, here with the community as well.
Problem:
Using the Xamarin.Forms PropertyChanged event handler, to check when ItemsSource has changed, is too soon in the lifecycle because the native control's items haven't had a chance to be populated yet.
Solution:
You can instead use the
NativeControlLoaded event, which will fire when the native TKExtendedListView control is ready.
Regards,
Lance | Tech Support Engineer, Sr.
Progress Telerik
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