void HideLightingFixtureHosts( View view )
{
Document doc = view.Document;
Categories categories = doc.Settings.Categories;
Category catLightingFixtures
= categories.get_Item(
BuiltInCategory.OST_LightingFixtures );
CategoryNameMap subcats
= catLightingFixtures.SubCategories;
Category catHosts = subcats.get_Item( "Hosts" );
//view.SetVisibility( catHosts, false ); // 2016
view.SetCategoryHidden( catHosts.Id, true ); // 2017
}