I am developing an application with Xamarin Forms. On one page I have a combobox and a picker. The combobox is autocompletable. When I start the app for the first time everything works fine, the combobox autocompletes the words and the picker shows the elements normally. The problem I have is that when I give back, that is, I leave that page and go back in, the combobox no longer works and the picker elements are empty. The package I'm using is this: link I get the values from a web service. The Json that I get is never null, it is validated, so the elements are saved in the List string that the combobox and the picker need to work.