updating object after edit

[Erik de Hair]

Hi,

I need to update some properties of an object after editing the same 
object (by using the Edit button). I tried this with updated() and 
updating() methods but like [1] says this doesn't work (at least not in 
this case). Is there any other way of doing this while using the Edit 
button or do I need to create an update action to do this. I believe the 
EventBus can only be used for actions?

Thanks,
Erik

[1] http://isis.apache.org/reference/Recognized-Methods-and-Prefixes.html