how to monitor changes on tables automatically

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I got a new problem:

I created a class that works fine with the monitoring but now my problem is the point to call this class.
I called the class from the SysDictField Class in the past but there is the problematic, that i haven't any info about the created elements in this stack.
So i have to select the records created in the last X seconds from Table UtilIdElements. But what if the user created new fields, forgets to save and then the timespan is over and i don't get the element if you understand what i'm trying to explain.

My new idea is to capture the save-Button Event. But i could not get into the toolbar, do you have any ideas how to break in this case ?

Thanks