Geektrovert
diff --git a/‎data/draft/flutter.md‎
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@@ -506,6 +506,85 @@ class _MyHomePageState extends State {
   }
 }
 ```
+## Refresh Indicator
+
+```dart
+RefreshIndicator(
+strokeWidth: 5,
+color: Colors.yellow,
+backroundColor: Colors.red,
+onRefresh: _refresh,
+child: ListView(),
+)
+```
+## Expansion Panel
+
+```dart
+// stores ExpansionPanel state information
+class Item {
+  Item({
+    required this.expandedValue,
+    required this.headerValue,
+    this.isExpanded = false,
+  });
+
+  String expandedValue;
+  String headerValue;
+  bool isExpanded;
+}
+
+List<Item> generateItems(int numberOfItems) {
+  return List<Item>.generate(numberOfItems, (int index) {
+    return Item(
+      headerValue: 'Panel $index',
+      expandedValue: 'This is item number $index',
+    );
+  });
+}
+
+// ...
+
+final List<Item> _data = generateItems(8);
+
+@override
+Widget build(BuildContext context) {
+  return SingleChildScrollView(
+    child: Container(
+      child: _buildPanel(),
+    ),
+  );
+}
+
+Widget _buildPanel() {
+  return ExpansionPanelList(
+    expansionCallback: (int index, bool isExpanded) {
+      setState(() {
+        _data[index].isExpanded = !isExpanded;
+      });
+    },
+    children: _data.map<ExpansionPanel>((Item item) {
+      return ExpansionPanel(
+        headerBuilder: (BuildContext context, bool isExpanded) {
+          return ListTile(
+            title: Text(item.headerValue),
+          );
+        },
+        body: ListTile(
+          title: Text(item.expandedValue),
+          subtitle: const Text('To delete this panel, tap the trash can icon'),
+          trailing: const Icon(Icons.delete),
+          onTap: () {
+            setState(() {
+              _data.removeWhere((Item currentItem) => item == currentItem);
+            });
+          }
+        ),
+        isExpanded: item.isExpanded,
+      );
+    }).toList(),
+  );
+}
+```
 
 ## Radio Button
 ```dart