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**[View document in Syncfusion .NET MAUI Knowledge Base](https://www.syncfusion.com/kb/13130/how-to-add-expand-or-collapse-icon-in-the-group-header-of-net-maui-listview-sflistview)**
+
+## Sample
+
+```xaml
+
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+ . . .
+ . . .
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+
+C#:
+
+ListView.DataSource.GroupDescriptors.Add(new GroupDescriptor()
+{
+ PropertyName = "ContactName",
+ KeySelector = (object obj1) =>
+ {
+ var item = (obj1 as ListViewContactInfo);
+ return item.ContactName[0].ToString();
+ },
+});
+
+public class BoolToImageConverter : IValueConverter
+{
+ public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+ {
+ return (bool)value ? "group_expand.png" : "group_collapse.png";
+ }
+
+ public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+ {
+ throw new NotImplementedException();
+ }
+}
+```
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