Update fields in Ajax Event of another field

Hi
i have an Ajax Event in my Field1 “on click”, which changes some data in my Database. After that i love to reload another (DoubleSelect) field2.

In field1 i crossed the checkbox “Use AJAX to reload other fields of type Select, Double select, Radio and Checkbox” and my field2 is updated correctly. But i don’t know, in which order these two Ajax Events running (update DB, update field2).
So i wish to update my field2 in the Ajax Event “on click” of field1.

field1 on click: 1. Update some DB stuff, 2. Update field2

Anyone some idea how to do this?

Best regards
Steve