CollectionView GridItemsLayout Change BackgroundColor of nested Item (Button) - xaml

Question

I have a problem concerning a CollectionView with a GridItemsLayout. In my application, I have a StackLayout with a horizontal CollectionView(GridItemsLayout), which contains a Button bound to a certain category.
Whenever a button is clicked/tapped, it filters the ListView (of type Surgery) below based on the category. All of that is working fine, however, I would like to highlight the Category/Button by changing it BackgroundColor to see which category is currently used for filtering.
<CollectionView HeightRequest="70"
x:Name="categoryCollection"
ItemsSource="{Binding Categories}"
Margin="20,0,20,0"
SelectionMode="Single">
<CollectionView.ItemsLayout>
<GridItemsLayout Orientation="Horizontal" Span="1" HorizontalItemSpacing="5"/>
</CollectionView.ItemsLayout>
<CollectionView.ItemTemplate>
<DataTemplate>
<Grid Padding="0,5,0,5">
<Button x:Name="categoryButton" Text="{Binding Name}"
Command="{Binding Path=BindingContext.FilterCommand, Source={x:Reference Name=SurgeryListView}}"
CommandParameter="{Binding .}"
CornerRadius="15"
FontFamily="OpenSans" Margin="0,5,10,5"
Opacity="0.6" FontSize="16" TextTransform="None">
</Button>
</Grid>
</DataTemplate>
</CollectionView.ItemTemplate>
</CollectionView>
<ListView x:Name="listView"
ItemsSource="{Binding Surgeries}"
RefreshCommand="{Binding LoadSurgeriesCommand}"
IsRefreshing="{Binding IsRefreshing}"
IsPullToRefreshEnabled="True"
RowHeight="70"
BackgroundColor="{StaticResource darkThemeBackground}"
ItemTemplate="{StaticResource surgeryDataTemplateSelector}">
<ListView.Behaviors>
<behaviors:EventToCommandBehavior
EventName="ItemTapped"
Command="{Binding SurgerySelectedCommand}"
EventArgsConverter="{StaticResource ItemTappedConverter}">
</behaviors:EventToCommandBehavior>
</ListView.Behaviors>
</ListView>
I tried to use VisualStates but that was not working, because tapping the button does not actually change the SelectedItem (one would need to click the surrounding/parent grid element for that). Moreover, the altered VisualState was only applied to the Grid's BackgroundColor, not to that of the actual button.
Question: How can I highlight the current Category/Button by changing its Background Color?

Answer 1

Since the selection is working good, remains only the ui/xaml part, if you look at the documentation about VisualStateManager, you can add the following style:
<CollectionView.Resources>
<Style TargetType="Grid">
<Setter Property="VisualStateManager.VisualStateGroups">
<VisualStateGroupList>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal" />
<VisualState x:Name="Selected">
<VisualState.Setters>
<Setter Property="BackgroundColor"
Value="LightSkyBlue" />
</VisualState.Setters>
</VisualState>
</VisualStateGroup>
</VisualStateGroupList>
</Setter>
</Style>
</CollectionView.Resources>