title: Xamarin.Forms Picker ItemsSource stays empty in XAML
body: <p>My picker stays empty. I already created a test list to test it in particular but it doesn't work either. </p>
  
  <p>this is my XAML </p>
  
  <pre><code>&lt;Picker x:Name="picker1" Grid.Row="1" Grid.Column="1" ItemsSource="{Binding TestList}" ItemDisplayBinding="{Binding Name}" SelectedItem="{Binding AdditionSort}"/&gt;
  </code></pre>
  
  <p>this is my code behind</p>
  
  <pre><code>List&lt;AdditionSort&gt; TestList
  {
      get =&gt; testList;
      set =&gt; SetValue(ref testList, value);
  }
  
  List&lt;AdditionSort&gt; testList = new List&lt;AdditionSort&gt;();
  
  void LoadList()
  {
      TestList.Add(new AdditionSort { Name = "test1" });
      TestList.Add(new AdditionSort { Name = "test2" });
  }
  </code></pre>
  
  <p>when I'm debugging I can see that my list is correct.</p>