How to handle the button event when ItemTapped event is triggered in SfListView for Android platform?

<ContentPage xmlns:listView="clr-namespace:Syncfusion.ListView.XForms;assembly=Syncfusion.SfListView.XForms"
             xmlns:dataSource="clr-namespace:Syncfusion.DataSource;assembly=Syncfusion.DataSource.Portable">
  <ContentPage.Content>
    <Grid>
      <listView:SfListView x:Name="listView"
                           ItemsSource="{Binding ContactsInfo}"
                           AutoFitMode="Height"
                           AllowGroupExpandCollapse="False">
        <listView:SfListView.GroupHeaderTemplate>
          <DataTemplate>
            <Grid BackgroundColor="Teal">
              <Grid.GestureRecognizers>
                <TapGestureRecognizer Tapped="TapGestureRecognizer_Tapped"/>
              </Grid.GestureRecognizers>
              <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="*"/>
              </Grid.ColumnDefinitions>
              <Label Text="{Binding Key}"
                     FontSize="22"
                     FontAttributes="Bold"/>
              <StackLayout Grid.Column="1" HorizontalOptions="End" VerticalOptions="End">
                <Button Clicked="Button_Clicked"
                        Text="count"
                        HorizontalOptions="End"
                        VerticalOptions="End"/>
              </StackLayout>
            </Grid>
          </DataTemplate>
        </listView:SfListView.GroupHeaderTemplate>
      </listView:SfListView>
    </Grid>
  </ContentPage.Content>
</ContentPage>

public partial class TappingMainPage : ContentPage
    {
        public TappingMainPage()
        {
            InitializeComponent();
            listView.DataSource.GroupDescriptors.Add(new GroupDescriptor()
            {
                PropertyName = "ContactName",
                 KeySelector = (object obj1) =>
                 {
                     var item = (obj1 as Contacts);
                     return item.ContactName[0].ToString();
                 },
            });
            listView.DataSource.SortDescriptors.Add(new SortDescriptor()
            {
                PropertyName = "ContactName",
                Direction =ListSortDirection.Ascending
            });
        }
        private void TapGestureRecognizer_Tapped(object sender, EventArgs e)
        {
            var grid = sender as Grid;
            var group = grid.BindingContext as GroupResult;
            if (group.IsExpand)
                listView.CollapseGroup(group);
            else
                listView.ExpandGroup(group);
        }
 
        private void Button_Clicked(object sender, EventArgs e)
        {
            var button = sender as Button;
            var group = button.BindingContext as GroupResult;
            DisplayAlert("Count",group.Count.ToString()+" "+"Contacts in the group", "Ok");
        }
    }