Extending Datastore Rename

Hi,


I'm new to using the vSphere Web Client SDK.  I'm writing a plugin and I would like to extend the functionality of renaming a datastore.  In particular, I just want to


1. perform additional checks and warnings (like how it currently warns "An objecty named "<name>" already exists.  Enter a new name."


2. perform additional actions when a user renames a datastore


In this particular case, I want vSphere to continue to do the same things that it is doing, but I just want to add additional functionality.


What would be the best way to go about this?  Like how do I take control of the "Rename..." action on a datastore and still call the original action?


Thanks!