title: Xamarin Forms CollectionView: Cannot give SelectedItem Transparent background
body: <p>I am using a CollectionView and when a user selects an item, I don't want the SelectedItem to show background color at all.  I have tried to achieve this effect by setting the BackgroundColor property to transparent with the VisualStateManager per the instructions in Xamarin's documentation. However, rather than the Item's Background being invisible it just becomes grayed-out when selected. The code works. If I set it to red, I see red. But I can't get the background to go away altogether.</p>
  
  <p>This is happening in iOS.</p>
  
  <p>Can anyone tell me how to do this?</p>
  
  <p>Here's my code:</p>
  
  <pre><code>&lt;Style TargetType="ContentView"&gt;
                  &lt;Setter Property="VisualStateManager.VisualStateGroups"&gt;
                      &lt;VisualStateGroupList&gt;
                          &lt;VisualStateGroup x:Name="CommonStates"&gt;
                              &lt;VisualState x:Name="Normal" /&gt;
                              &lt;VisualState x:Name="Selected"&gt;
                                  &lt;VisualState.Setters&gt;
                                      &lt;Setter Property="BackgroundColor"
                                          Value="Transparent" /&gt;
                                  &lt;/VisualState.Setters&gt;
                              &lt;/VisualState&gt;
                          &lt;/VisualStateGroup&gt;
                      &lt;/VisualStateGroupList&gt;
                  &lt;/Setter&gt;
              &lt;/Style&gt;
  
  &lt;CollectionView Grid.Row="0" ItemsSource="{Binding Lessons}"  BackgroundColor="Transparent"
                    SelectedItem="{Binding SelectedLesson, Mode=TwoWay}" HorizontalOptions="FillAndExpand"
  
                          SelectionMode="Single"
                          cal:Message.Attach="[Event SelectionChanged] = [Action ActivateLesson]"&gt;
              &lt;CollectionView.ItemTemplate &gt;
                  &lt;DataTemplate x:DataType="engineVm:LessonViewModel"&gt;
                      &lt;ContentView BackgroundColor="Transparent" cal:View.Model="{Binding}" HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand" Margin="0, 0, 0, 20" /&gt;
                  &lt;/DataTemplate&gt;
              &lt;/CollectionView.ItemTemplate&gt;
          &lt;/CollectionView&gt;
  </code></pre>