How to enable load more after loading in xamarin.forms listview?

 
<ContentPage xmlns:syncfusion="clr-namespace:Syncfusion.ListView.XForms;assembly=Syncfusion.SfListView.XForms">
 
    <ContentPage.Resources>
        <ResourceDictionary>
            <helper:InverseBoolConverter x:Key="inverseBoolConverter"/>
        </ResourceDictionary>
    </ContentPage.Resources>
 
    <ContentPage.Content>
        <Grid>
            <Button Text="Enable/Disable load more"
                    Command="{Binding BindingContext.LoadMoreEnableCommand,Source={x:Reference Name=listView}}" 
                    CommandParameter="{Binding .,Source={x:Reference Name=listView}}"/>
            <syncfusion:SfListView x:Name="listView" 
                                   ItemSize="120"
                                   LoadMoreOption="{Binding EnableLoadMore}"
                                   LoadMoreCommand="{Binding LoadMoreItemsCommand}"
                                   LoadMoreCommandParameter="{Binding Source={x:Reference Name=listView}}"
                                   IsBusy="{Binding IsBusy}"
                                   ItemsSource="{Binding Products}">
                <syncfusion:SfListView.ItemTemplate>
                    <DataTemplate>
                        <Grid>
                            <Label Text="{Binding ContactName}"/>
                        </Grid>
                    </DataTemplate>
                </syncfusion:SfListView.ItemTemplate>
            </syncfusion:SfListView>
        </Grid>
    </ContentPage.Content>
</ContentPage>

LoadMoreEnableCommand = new Command<object>(OnEnableClicked);
private void OnEnableClicked(object obj)
{
    if (EnableLoadMore == LoadMoreOption.None)
        EnableLoadMore = LoadMoreOption.Auto;
    else
        EnableLoadMore = LoadMoreOption.None;
}