Why does my IsVisible Binding Not Work with a StackLayout ? Xamarin iOS - xamarin

Question

I have the below XAML structure using a collection view which is using a list called 'users' as its ItemSource. I have a bound property which controls if the items are visible or not :
<StackLayout Orientation="Horizontal">
<Frame IsVisible="{Binding isVisible}" HasShadow="True" BackgroundColor="White" Padding="0">
The issue is that unless I remove the StackLayout around the Frame then the IsVisible binding doesn't work. Does anyone know why the binding works without the StackLayout, but not with ?
<CollectionView Grid.Row="1" x:Name="users" IsGrouped="True" SelectionMode="Single">
<CollectionView.GroupHeaderTemplate>
<DataTemplate>
<StackLayout Orientation="Horizontal" MinimumHeightRequest="200" BackgroundColor="{Binding tint_colour}">
<Image Source="{Binding school_image}" WidthRequest="120" HeightRequest="100"/>
<Label Text="{Binding organisation_title}"
TextColor="{Binding font_colour}"
FontSize="Large"
FontAttributes="Bold"
VerticalTextAlignment="Center"></Label>
<StackLayout.GestureRecognizers>
<TapGestureRecognizer Tapped="HeaderTapped" CommandParameter="{Binding organisation_title}"></TapGestureRecognizer>
</StackLayout.GestureRecognizers>
</StackLayout>
</DataTemplate>
</CollectionView.GroupHeaderTemplate>
<CollectionView.ItemsLayout>
<LinearItemsLayout Orientation="Vertical" ItemSpacing="1"/>
</CollectionView.ItemsLayout>
<CollectionView.ItemTemplate>
<DataTemplate>
<StackLayout Orientation="Horizontal">
<Frame IsVisible="{Binding isVisible}" HasShadow="True" BackgroundColor="White" Padding="0">
<Grid VerticalOptions="FillAndExpand" HorizontalOptions="FillAndExpand">
<behaviors:Expander x:Name="MainExpander" CollapseAnimationLength="500" IsExpanded="False" IsVisible="True" >
<behaviors:Expander.Header>
<Grid HorizontalOptions="FillAndExpand">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="100"/>
<ColumnDefinition Width="10"/>
</Grid.ColumnDefinitions>
<Frame HeightRequest="40" WidthRequest="40" CornerRadius="20" HorizontalOptions="Start" VerticalOptions="Center" Margin="20" Padding="0" BackgroundColor="Maroon">
<Label Text="{Binding student_initial}" TextColor="White" HorizontalOptions="Center" VerticalOptions="Center" HorizontalTextAlignment="Center" VerticalTextAlignment="Center" />
</Frame>
<StackLayout Grid.Column="2" HorizontalOptions="StartAndExpand" VerticalOptions="Center" Margin="20">
<Label IsVisible="{Binding isVisible}" x:Name="StudentName" Text="{Binding student_fullname}"></Label>
<Label x:Name="StudentID" IsVisible="false" Text="{Binding student_unique_id}"></Label>
</StackLayout>
</Grid>
</behaviors:Expander.Header>
<Grid RowSpacing="0" HorizontalOptions="FillAndExpand" HeightRequest="240" VerticalOptions="FillAndExpand">
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<Button Grid.Row="0" Text="Messages" Clicked="Button_Clicked"></Button>
<Button x:Name="btnTopUp" Grid.Row="1" Text="Quick Topup" Clicked="Button_Clicked" IsVisible="{Binding topup_product_id, Converter={StaticResource IsNotNullOrEmptyConverter}}"></Button>
<Button Grid.Row="2" Text="Payments" Clicked="Button_Clicked"></Button>
</Grid>
<!-- TODO: Look at adding a balance for childrens topups? -->
</behaviors:Expander>
</Grid>
</Frame>
</StackLayout>
</DataTemplate>
</CollectionView.ItemTemplate>
</CollectionView>

Answer 1

I did a test about it and it works fine, here are xaml and codebehind:
xmal:
<StackLayout>
<CollectionView x:Name="mycol">
<CollectionView.ItemTemplate>
<DataTemplate>
<StackLayout >
<Frame BackgroundColor="Red" IsVisible="{Binding isvisible}">
<Label Text="{Binding Name}"/>
</Frame>
</StackLayout>
</DataTemplate>
</CollectionView.ItemTemplate>
</CollectionView>
</StackLayout>
codebehind:
public partial class CollectionTest : ContentPage
{
ObservableCollection<People> peoples = new ObservableCollection<People> {
new People{ Name="Adam",isvisible=true},
new People{ Name="Bob",isvisible=true},
new People {Name="Adam2",isvisible=false },
new People{ Name="Bob2",isvisible=true} };
public CollectionTest()
{
InitializeComponent();
mycol.ItemsSource = peoples;
}