PRAddCommand #children

Hi, I have a container component that renders a series of subcomponents. The number of subcomponents is based on the number children within my structure. My initial implementation cached the components and returned the cache within #children and iterated over the cache within #renderContentOn:. A problem arises when I add a new child to my structure. The container component needs to invalidate it's cache when the structure changes or once I rendering cycle completes. I tried hooking into #initialRequest: but that didn't seem to be called each time I visited the page. I guess I could use Announcements but wonder if there is a simpler solution? Thanks in advance Nick