Thanks very much. I have also find this way but your example was very helpful anyway.
Firstly I need to find out how it works then I would create override.
When I tried it I found the comment that I should create method with name "bulkActionName". But in reality it is name "processBulkActionName".
For me this is a little misleading. Why there is the word "process" in the beginning?
If I follow that comment then it will not work.
Best regards