如何在具有RadListView分组功能的类别标题上抓取点击？(Nativescript)

<Page xmlns="http://schemas.nativescript.org/tns.xsd" loaded="pageLoaded">
    <RadListView id="listView" items="{{ items }}" groupingFunction="{{ groupItems }}">
        <RadListView.itemTemplate>
            <GridLayout columns="auto, *">
                <Label text="{{ name }}" col="0" tap="onCategoryTap" class="category-title"></Label>
                <Label text="{{ description }}" col="1"></Label>
            </GridLayout>
        </RadListView.itemTemplate>
        <RadListView.groupingFunction>
            <Label text="{{ key }}" class="category-title"></Label>
        </RadListView.groupingFunction>
    </RadListView>
</Page>

function pageLoaded(args) {
    var page = args.object;
    page.bindingContext = viewModel;
}

function onCategoryTap(args) {
    var tappedCategory = args.object.text;
    // 执行相应的操作，如展开/折叠分组、加载更多数据等
}

exports.pageLoaded = pageLoaded;
exports.onCategoryTap = onCategoryTap;