How to correctly bind the Visibility of a button to the presence of objects in ListView.SelectedItems?

Question

Windows phone

I started with a simple Win Phone 7 Silverlight application. I did everything as it turned out - no BestPractise, a lot of code behind. Now I switched to Win Phone 8 Store Application - paired with the MVVM pattern. I try to use only binding and commands.
There is a simple case: we have a list of elements with the ability to select several of them; button on the AppBar to remove the selected items. It is necessary to organize a simple behavior: if there are no selected elements, hide the button. But an attempt to solve this problem by binding on the ListView.SelectedItems property was not successful - it is read-only and cannot be used for binding.
Hence the question: is there a 'classical' solution for this situation?
(Is it possible to break everything down with XAML alone?)

Answer 1

Look towards converters.