DataCacheHelper.GetCachedX<>() and dependencies

Hi,

I understand adding dependencies to cached data when using CacheHelper.Add():

CacheHelper.Add(.....,CacheHelper.GetCacheDependency(...),....);

But I wonder how to set dependencies when using one of the DataCacheHelper.GetCachedX methods? They don't accept a CMSCacheDependency object, but instead want a dependency callback (the 2nd last parameter). All examples I found have this parameter set to null.

Would anyone mind giving me a quick example how to define a cache dependency when using GetCachedX() ?

Thanks in advance Stefan