@jmdobry But I don't want to listem to all "comment" changes, just the one that of the object I am currently looking at. Let say I have thousands of entity, each could have many comments. When I look at one entity then I want to listen to all comments change on that entity, but as soon as I am done, I will stop listening until next time. At that point I will do a refresh, bind to only the comments I need. I have it working, but I am always wondering the impact on memory in the long run.