How to expand and collapse TreeView node using image instead expander

 
<ContentPage xmlns:treeview="clr-namespace:Syncfusion.XForms.TreeView;assembly=Syncfusion.SfTreeView.XForms">
    <ContentPage.BindingContext>
        <local:FileManagerViewModel x:Name="viewModel"></local:FileManagerViewModel>
    </ContentPage.BindingContext>
    <ContentPage.Resources>
        <ResourceDictionary>
            <local:ExpanderIconVisibilityConverter x:Key="ExpanderIconVisibilityConverter"/>
            <local:ExpanderIconConverter x:Key="ExpanderIconConverter" />
        </ResourceDictionary>
    </ContentPage.Resources>
    <ContentPage.Content>
        <treeview:SfTreeView x:Name="treeView"
                             Indentation="40"
                             ExpanderWidth="0"
                             AutoExpandMode="None"
                             ItemTemplateContextType="Node"
                             ChildPropertyName="SubFiles"
                             ItemsSource="{Binding ImageNodeInfo}">
                          <treeview:SfTreeView.ItemTemplate>
                <DataTemplate>
                    <ViewCell>
                        <ViewCell.View>
                            <Grid >
                                <Label Text="{Binding Content.ItemName}"/>
                                <Image Grid.Column="2" Source="{Binding IsExpanded,Converter={StaticResource ExpanderIconConverter}}"
                                       IsVisible="{Binding HasChildNodes,Converter={StaticResource ExpanderIconVisibilityConverter}}">                                        
 
                                    <Image.GestureRecognizers>
                                        <TapGestureRecognizer Tapped="TapGestureRecognizer_ Tapped" />
                                    </Image.GestureRecognizers>
                                </Image>
                            </Grid>
                        </ViewCell.View>
                    </ViewCell>
                </DataTemplate>                
            </treeview:SfTreeView.ItemTemplate>
        </treeview:SfTreeView>
     </ContentPage.Content>
</ContentPage>
 

 
namespace GettingStartedBound
{
    public class ExpanderIconConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            Assembly assembly = typeof(App).GetTypeInfo().Assembly;
            return (bool)value ? ImageSource.FromResource("GettingStartedBound.Icons.expand.png", assembly) : ImageSource.FromResource("GettingStartedBound.Icons.collapse.png", assembly);
        }
 
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
    public class ExpanderIconVisibilityConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            Assembly assembly = typeof(App).GetTypeInfo().Assembly;
            return (bool)value ? true: false;
        }
 
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException(); 
        }
    }
}
 

private void TapGestureRecognizer_Tapped(object sender, EventArgs e)
{
   var imageIcon = sender as Image;
   var treeViewNode = imageIcon.BindingContext as TreeViewNode;
   if (treeViewNode.IsExpanded)
       TreeView.CollapseNode(treeViewNode);
   else
       TreeView.ExpandNode(treeViewNode);
}