Where to find this script?

Hello everyone,
I have this event on my UDT who is writing 42 in another variable. What I want to know Is where the function ValueChaned is defined ? I looked in All the scripts that I have in my project but I didn't find it.
I Also dida find function but nothing in the results.
Can someone tell me how can I Find this function so I can change some parameters ?

A tag's valueChanged event is a built-in function in Ignition tags. It is "fired" any time the value of the tag changes.