Hi Paulo,
I redirected your three threads to the same one as they are all basically the same question with the same answer.
To connect the data displayed in two controls one can "Data Bind" the controls together. This can be done directly (Control X binds to Control Y), but more commonly we separate out the data from the presentation: create a backing class with the data we want the controls to show and then bind both controls to that data.
To get started on Data Binding see the documentation starting at Xamarin.Forms / App Fundamentals / Data Binding