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.
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.
You can instead use the NativeControlLoaded
event, which will fire when the native TKExtendedListView control is ready.
// event subscription (can also be done in XAML)
listView.NativeControlLoaded += listView_NativeControlLoaded;
// event handler
sender, EventArgs e)
var dataView =
Lance | Tech Support Engineer, Sr.
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