Show tick image when item is selected in WPF Listbox - wpf

Question

I have this simple ListBox which displays a list of images horizontal en vertical.
I have also added a tick image on every image. Now I would like to enable this tick image only when the item is selected in the Listbox.
How can I achieve this?
ListBox XAML:
<ListBox x:Name="PhotoCollection"
Grid.Row="2"
Grid.ColumnSpan="4"
ItemsSource="{Binding PhotoCollection, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
ScrollViewer.HorizontalScrollBarVisibility="Disabled"
SelectionMode="Multiple">
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Vertical">
<Border BorderBrush="White"
BorderThickness="2"
Margin="5"
Background="LightGray">
<Grid>
<Image Source="{Binding}"
Stretch="Uniform"
Width="50"
Height="50"
Margin="5" />
<Image Source="{StaticResource Check_24}"
Visibility="{Binding Converter={StaticResource VisibleConverter}, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type ListBoxItem}, AncestorLevel=1},Path=IsSelected}"
Stretch="Uniform"
Width="20"
Height="20"
Margin="5"
HorizontalAlignment="Right"
VerticalAlignment="Bottom"/>
</Grid>
</Border>
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel IsItemsHost="True"
Orientation="Horizontal" />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
EDIT: This line does the trick
Visibility="{Binding Converter={StaticResource VisibleConverter}, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type ListBoxItem}, AncestorLevel=1},Path=IsSelected}"

Answer 1

It should work when you bind the IsSelected property of the ListBoxItem to your property IsVisible. But it depends on how you have implemented your ViewModel and the properties.
<ListBox>
<!-- the rest of the XAML-Definition of your ListBox -->
<ListBox.ItemContainerStyle>
<Style TargetType="ListBoxItem">
<Setter Property="IsSelected" Value="{Binding IsVisible, Mode=TwoWay}"/>
</Style>
</ListBox.ItemContainerStyle>
</ListBox>

Answer 2

When I need to bind visibility of items to boolean values, I've been using a converter class:
public class BoolToVisibleOrHidden : IValueConverter {
public BoolToVisibleOrHidden() { }
public bool Collapse { get; set; }
public bool Reverse { get; set; }
public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {
bool bValue = (bool)value;
if (bValue != Reverse) {
return Visibility.Visible;
} else {
if (Collapse)
return Visibility.Collapsed;
else
return Visibility.Hidden;
}
}
public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) {
Visibility visibility = (Visibility)value;
if (visibility == Visibility.Visible)
return !Reverse;
else
return Reverse;
}
}
After grabbing an instance of it in XAML like so :
<local:BoolToVisibleOrHidden x:Key="BoolToVisConverter" Collapse="True" />
I can bind visibility of items like this:
Visibility="{Binding Converter={StaticResource BoolToVisConverter}, Path=DataContext.PATHTOBOOLEAN}"