<ListBox>
<ListBox.ItemTemplate>
	<DataTemplate>
		<StackPanel>
			<TextBlock Text="{Binding Name}" />
			<StackPanel Orientation="Vertical" x:Name="contentPanel" >
			Content goes here...
			</StackPanel>
		</StackPanel>
	</DataTemplate>
</ListBox.ItemTemplate>

<StackPanel Visibility="{Binding YourBoolProperty, Converter={StaticResource boolToVisibilityResourceRef ..../>