private async void lv_category_ItemClick(object sender, ItemClickEventArgs e)
{
var item = e.ClickedItem as FavoriteItem <Category>;
if (item != null)
{
// set as not new post
item.HasNew = false;
var destCate = await PostHelper.GetCategory(item.Item.Id);
if (destCate != null)
{
Frame.Navigate(typeof(CategoryPostsPage), destCate);
}
}
}