Flutter: rebuild ListView from ListTile - flutter

Question

I have a ListView inside of a FutureBuilder. This FutureBuilder loads a list from disk and once loaded, shows a ListView. This ListView has a custom ItemTile to show for each loaded item. Each ItemTile has a button to copy itself (i.e. writing a copy of itself to memory). How can I now inform the ListView to be rebuild?
This is how my ItemTile is implemented (I only included the relevant code).
#override
Widget build(BuildContext context) {
return InkWell(
child: Card(
semanticContainer: false,
//This flag should be false if the card contains multiple different types of content.
child: Container(
height: 200,
width: double.infinity,
child:
Align(
alignment: Alignment.topRight,
child: getPopUpMenuButton(context),
)
),
),
);
}
PopupMenuButton<String> getPopUpMenuButton(BuildContext context) {
return PopupMenuButton(
onSelected: (str) {
switch (str) {
case 'MAKECOPY':
{
Item newItem = Item.clone(this.item, sameUID: false);
Scaffold.of(context).setState(() {
_itemManager.save(newItem);
});
}
}
},
icon: Icon(Icons.more_vert),
itemBuilder: (_) => <PopupMenuItem<String>>[
new PopupMenuItem<String>(
value: 'MAKECOPY',
child: Text(AppLocalizations.of(context).get('edit_as_copy'))),
],
);
}
I assumed the Scaffold.of(context).setState would do the trick but it does not. How do I correctly call a rebuild of the ListView/FutureBuilder from a list item?