Data Access Handler

[#1]

How can I define a function that is activated when Jmp accesses the data in a column.

I found the Event Handler option in the Column Properties. 

But there I can only define functions for the cases: Click, and Mouseover (and I can set the color of the link)

- but there are no settings for Write Data Access and Read Data Access.

Applications:

- To check the performance of code (https://community.jmp.com/t5/Discussions/Differentiate-between-entire-column-and-current-row/m-p/677...)

- to bugfix my code

- to find out more about the nuts and bolts behind Jmp (https://community.jmp.com/t5/Discussions/Differentiate-between-entire-column-and-current-row/m-p/677...https://community.jmp.com/t5/JMP-Wish-List/Speed-up-Tables-Update/idi-p/652189 )

It's clear that there is a lot of data access in the background (update of Header Histograms, update of table view, Graphbuilder updates ...)