OK after about 5 hours of trying everything to get a Dropdown list in Xamarin I have to concede defeat.
I have a list of years that I want to "pick" from. I have tried the following:
Used Grid/StackLayout to host the Picker control. No difference (tried this because a post said that was his problem.
Tried List and ObservableCollection as the property containing the years (again because someone said that solves the problem) but it didn't.
Used XAML to indicate binding of ItemsSource and used c# code to set the property.
The basic results of every experiment was that I get a line. Yes a line. That is all , there is no dropdown, no list , actually nothing useful.
I really cannot understand why a dropdown list seems to be such a lost item for Xamaring.