I'll upload the complete solution.
i have created a new project with visual studio and Sync fusion template selector, selected .net 4.7.1 and in the poject properties the target framework is .net standard 2.0.
i have checked the sfListView sample and changed it to work with stacklayout instead of the heavy nested grids that was there.
the sample that i followed was the accordion one. (but without the behavior).
the ItemsSource property is binded, i have a collection of 3 objects and sfListView show 3 objects, but empty.