public async Task Build() { int cityMax = datamodel.cities.Count; for (int i = 0; i < cityMax; i++) { TownView town = new TownView(); town.setdata(datamodel.cities[i].id, datamodel.cities[i].name); town.SetDelegate(ClickOnMain); town.Opacity = 0; layout.Children.Add(town); pickerlist.Add(town); } await Show(); }