<ListView>
	<ListView.ItemTemplate>
		<DataTemplate>
			<StackPanel Hold="Item_Hold">
				<FlyoutBase.AttachedFlyout>
					<MenuFlyout>
						<MenuFlyoutItem Text="Opzione"/>
					</MenuFlyout>
				</FlyoutBase.AttachedFlyout>
				<!-- Il tuo contenuto -->
			</StackPanel>
		</DataTemplate>
	</ListView.ItemTemplate>
</ListView>

public void Item_Hold(...)
{
	FlyoutBase.ShowAttachedFlyout(sender as FrameworkElement);
}